↑ Search Terms for HF Radio propagation

This page is part of the project "Understanding HF Propagation."
by Doron Tal, 4X4XM


Search terms addressed on this website
    A
  1. A beginner's guide to HF radio propagation
  2. A beginners guide to radio propagation
  3. A combination of long-term prediction and short-term forecast methods
  4. A comparison between Radio and Light propagation phenomena
  5. A comprehensive beginner's guide for RF propagation
  6. A comprehensive guide to HF propagation
  7. A guide for ham radio propagation
  8. A guide to HF propagation
  9. A primer on space weather
  10. A quick guide to solar indices — A review of skywave propagation indicators
  11. A-index
  12. Absorption
  13. ACE
  14. Active sun
  15. Advanced Techniques in HF Propagation Forecast
  16. ALE — Automatic link establishment
  17. Alerts
  18. All-in-One HF Propagation Resource
  19. Amateur ham radio
  20. Amateur radio
  21. Amateur radio bands
  22. Amateur radio charactaristics
  23. Amateur radio band conditions
  24. Amateur radio frequencies
  25. Amateur radio frequency allocations
  26. Amateur radio grey line
  27. Amateur radio HF band conditions
  28. Amateur radio HF propagation conditions
  29. Amateur radio HF propagation frequencies & forecast
  30. Amateur radio live maps
  31. Amateur radio maps site
  32. Amateur radio online propagation charts
  33. Amateur radio online propagation conditions
  34. Amateur radio online propagation maps
  35. Amateur radio operator
  36. Amateur radio propagation conditions
  37. Amateur radio propagation forecast
  38. Amateur radio propagation frequencies
  39. Amateur Radio Propagation Map
  40. Amateur Radio Propagation Now
  41. Amateur radio propagation studies
  42. Amateur radio propagation today
  43. Amateur radio solar activity
  44. Amateur radio space weather
  45. Amateur Radio Usable HF Propagation Frequencies & Forecast
  46. Amplitude of radio waves
  47. An introduction to HF propagation
  48. An Introduction to Ionosphere and Magnetosphere(Abstract)
  49. An introduction to radio wave propagation
  50. Antenna directivity
  51. Antenna efficiency
  52. Antenna for NVIS
  53. Antenna gain
  54. Antenna height
  55. Antenna height, directivity, gain
  56. Applications for analyzing and forecasting HF propagation
  57. Applications used for forecasts and predictions (references — list of sources)
  58. Are there any benefits to solar activity?
  59. Aurora | At what Kp index can I see aurora?
  60. Aurora forecast
  61. Aurora light show
  62. Auroral Radar Network (references — list of sources)
  63. Australian Space Weather Alert System (2024)
  64.  
    B
  65. Band conditions
  66. Band conditions banner
  67. Band conditions based on DX charts, PSKR, WSPR, WebSDRs, Beacons
  68. Band conditions charts
  69. Band Conditions Forecast
  70. Band Conditions Ham Radio
  71. Band Conditions—Ham Radio Live
  72. Band Opennings
  73. Banners and widgets
  74. Basic Amateur Radio—HF Propagation
  75. Basic electromagnetic wave properties
  76. Basic EM wave properties
  77. Basic EM wave properties (references — list of sources)
  78. Basic Wave Propagation, Nor Hadzfizah Binti Mohd Radi (2017)
  79. Basics for Short Wave Operation
  80. Basics of HF propagation
  81. Basics of HF radio propagation
  82. Basics of Radio Waves
  83. Basics of Radio Wave propagation
  84. Be prepared for volatile band conditions
  85. Be ready to try new frequencies
  86. Beacons
  87. Beginner's Guide to Ham Radio Range
  88. Benefits of the HAARP Project for Radio Hams
  89. Best HF frequencies for daytime
  90. Best propagation frequency
  91. Best solar propagation frequency
  92. Beyond line of site (BLOS)
  93. Blackouts what are they?
  94. Blind zone
  95. BLOS (Beyond line of site)
  96. Bt - total strength of the Interplanetary Magnetic field (IMF)
  97. Bz - orientation of the IMF
  98.  
    C
  99. Calculation of the maximum usable frequency
  100. Can a ham radio reach space?
  101. Can ham radio communicate with the other side of the globe?
  102. Can ham radio talk around the world?
  103. Can HF radio propagation be predicted?
  104. Can I get shorwave radio on my PC?
  105. Carrington event
  106. CF vs MUF—Difference between CF and MUF
  107. CF vs MUF: Understanding Critical and Maximum Usable Frequencies
  108. Challenges in storm forecasting
  109. Characteristics of radio waves
  110. ChatGPT learns about forecasting tools for radio amateurs
  111. Check DX Propagation with Beacons
  112. Chirping
  113. Choosing the right frequency for the best skywave propagation
  114. Clouds of plasma in the ionosphere
  115. CME - coronal Mass ejection
  116. Communication blackout
  117. Communication blackout 2024
  118. Communication blackout meaning
  119. Communication blackout today
  120. Compare DR2W propagation tool with VOACAP
  121. Compare forecasting tools for HF radio propagation
  122. Compare forecasting tools for radio amateurs
  123. Comparing Ionospheric MUF using IRI16 Model with Mid Latitude (2020)
  124. Communication conditions
  125. Complex HF propagation Modes
  126. Conductive ground
  127. Correlation analysis of Solar activity and Cosmic ray (J_Phys_Conf 2017)
  128. Correlation of Sunspot Numbers and Geomagnetic Indices with Various Climate Change Parameters (2024)
  129. Correlation between conditions, MUF, SSN and SFI
  130. Correlation between K and A values
  131. Correlation between MUF and solar flux
  132. Correlation Between solar flux and sunspot number
  133. Correlation of sunspot numbers and geomagnetic indices
  134. Correlation between sunspot numbers and geomagnetic parameters for solar cycle 24
  135. Coronal hole
  136. Coronal Mass ejection (CME)
  137. Critical frequencies foF2, MUF, OTF, LUF
  138. Critical Frequencies LUF vs MUF
  139. Critical frequency
  140. Critical frequency formula
  141. Critical frequency propagation
  142. Critique of IONCAP's Reliability and Service Probability Calculations (1993)
  143. Current band conditions
  144. Current flare
  145. Current ham bands conditions
  146. Current ham radio conditions
  147. Current ham radio HF propagation
  148. Current ham radio propagation
  149. Current ham radio propagation chart
  150. Current ham radio propagation conditions
  151. Current HF band conditions
  152. Current HF Band Conditions Maps For Radio Operators
  153. Current HF Band conditions online map
  154. Current HF Bands Conditions—Charts for Radio Hams
  155. Current HF conditions
  156. Current HF propagation
  157. Current HF propagation
  158. Current HF Propagation Conditions
  159. Current HF Propagation Conditions FAQ
  160. Current HF propagation conditions maps for radio operators
  161. Current HF propagation map
  162. Current HF radio propagation
  163. Current Kp index
  164. Current MUF
  165. Current optimal frequency charts
  166. Current propagation chart
  167. Current propagation conditions
  168. Current radio communication conditions
  169. Current radio propagation conditions
  170. Current shortwave propagation conditions
  171. Current Shortwave propagation conditions map
  172. Current skywave propagation
  173. Current solar activity
  174. Current solar alerts
  175. Current solar conditions Ham radio
  176. Current solar cycle prediction
  177. Current solar events
  178. Current Solar Flare
  179. Current space weather parameters
  180. Current sunspot cycle
  181. Current sunspot cycle activity
  182. Critical frequency
  183. Critical frequency map/chart
  184.  
    D
  185. D layer of ionosphere is rather a region
  186. D region
  187. D-Rap
  188. D-Region Absorption Prediction
  189. Daily sunspots groups
  190. Day night live world map
  191. Day-night—diurnal cycle
  192. Dead Zone
  193. Definition of the Ionospheric Regions
  194. Decoding space weather data for HF propagation
  195. Detection and Localization of F-layer Ionospheric Irregularities (2022)
  196. Digisonde Directogram
  197. Digital Reporter
  198. Direct wave propagation
  199. Dispertion of light
  200. Dispersion of radio waves
  201. Disturbance-storm time (Dst) index
  202. Diurnal cycle
  203. DR2W - DX propagation
  204. Dst
  205. DX band conditions
  206. DX charts
  207. DX conditions
  208. DX clusters or DX Spots
  209. DX cluster is your friend
  210. DX ham band conditions
  211. DX map | DX propagation map
  212. DX propagation online map
  213. DX propagation prediction
  214. DX radio live
  215. DXMAPS
  216. DXView HF
  217. DXView map
  218. DXWatch
  219. DXZone
  220.  
    E
  221. E layer of ionosphere is rather a region
  222. E-region
  223. E-sporadic forecast - propquest
  224. Earth's Atmosphere Layers
  225. Earth's Ionosphere Regions
  226. Earth's magnetic field
  227. Earth's Magnetosphere
  228. Earth Magnetosphere vs Earth's magnetic field
  229. Earth observing system (EOS)
  230. Earth's magnetic field
  231. Easy learning radio propagation
  232. Effects of geomagnetic storms on ham radio
  233. Effects of geomagnetic storms on radio hams
  234. Effects of ionospheric motions and irregularities on HF radio propagation
  235. Effects of radio waves
  236. Effects of solar activity on amateur radio
  237. Electromagnetic Spectrum
  238. Electromagnetic Radiation
  239. Electromagnetic Wave
  240. Electromagnetic Waves Basics
  241. Electron densities
  242. Electron flux (Ef)
  243. Elevation Angle
  244. EM wave Properties
  245. EME Deg - earth-Moon-Earth Degradation
  246. Equatorial Spread-F Ionospheric dynamics (1962)
  247. EsEU - Sporadic E Europe
  248. EsNA - Sporadic E North America
  249. Estimated sunspot number
  250. Etymology of ham radio
  251. EUV sunlight
  252. Evolution of Forecasting Techniques
  253. Explain HF propagation charts
  254. Explain HF propagation indicators
  255. Explain HF propagation indices
  256. Explain propagation banners
  257. Explain skywave erratic propagation conditions
  258. Explain skywave propagation
  259. Explain space weather for radio amateurs
  260. Explain space weather indices
  261. Explain solar indices
  262.  
    F
  263. F layer of ionosphere is rather a region
  264. Fadeouts
  265. Fading
  266. Fading due to irregularities of ionospheric regions
  267. FAQ about HF propagation
  268. F10.7
  269. F-region
  270. Find charts showing the live conditions
  271. Find your opening on the map
  272. Finding the best operating frequencies for skywave propagation
  273. Flares
  274. foF2 (critical frequency)
  275. foF2 map
  276. Forecast ham bands conditions
  277. Forecast HF bands conditions
  278. Forecast HF propagation conditions
  279. Forecast HF radio propagation - applications
  280. Forecast HF propagation conditions
  281. Forecast of HF propagation for radio amateurs
  282. Forecast of The Ham radio propagation
  283. Forecast propagation
  284. Forecast propagation for radio amateurs
  285. Forecast Proton flux
  286. Forecast short wave propagation conditions
  287. Forecast skywave propagation
  288. Forecast solar flare
  289. Forecast vs Prediction
  290. Forecast vs prediction of HF band conditions
  291. Forecasting and Prediction
  292. Forecasting evolution over the last 30 years
  293. Forecasting HF propagation for radio amateurs
  294. Forecasting ionospheric disturbances
  295. Forecasting MUF for a 3000 km path
  296. Forecasting tools for radio amateurs
  297. Forecasting vs. Prediction
  298. Free Electron Density
  299. Free gray line map
  300. Free Resource for Amateur Radio Beginners
  301. Frequency Allocations
  302. Frequency of optimum transmission (FOT)
  303. Frequency of optimum traffic (FOT)
  304. Fundamentals of radio propagation
  305. Fundamentals of radio waves propagation
  306.  
    G
  307. G0-G5: scale of geomagnetic activity
  308. Gamma rays
  309. Gama rays bursts (GRB) a cosmic event
  310. "GeoMag" (index) - earth`s geomagnetic field activity
  311. Geomagnetic
  312. Geomagnetic activity
  313. Geomagnetic activity forecast
  314. Geomagnetic conditions
  315. Geomagnetic data
  316. Geomagnetic disturbance | Geomagnetic disturbances
  317. Geomagnetic field activity
  318. Geomagnetic forecast
  319. Geomagnetic indices K, A, HPo | Geomagnetic Indices
  320. Geomagnetic Indices Explained Quick guide
  321. Geomagnetic storms
  322. Geomagnetic storm and equatorial spread-F (2004)
  323. Geomagnetic Storm Dynamics
  324. Geomagnetic storm ham radio
  325. Geomagnetic Storm Impacts
  326. Geomagnetic storms ham radio
  327. Geomagnetic storm radio amateur
  328. Geomagnetic storms
  329. Geophysical activity
  330. Getting Started in HF
  331. Global conditions | Global conditions banners
  332. Global HF conditions
  333. Global HF fadeout
  334. Global HF propagation
  335. Global radio propagation conditions
  336. Global vs Regional HF propagation conditions
  337. Gray line greyline
  338. Gray line live map
  339. Gray line propagation
  340. GRB - Gama-rays bursts
  341. Grey Line Map
  342. Grey line map real time
  343. Greyline
  344. Greyline propagation
  345. Greyline radio propagation explained
  346. Greyline vs "Solar Terminator"
  347. Ground wave and sky propagation
  348. Ground wave propagation
  349. Ground wave vs skywave
  350. Ground waves
  351. Guide for radio hams about HF propagation
  352. Guide to radio wave propagation, studies, guides and documentation
  353.  
    H
  354. Hale cycle
  355. Ham band conditions
  356. Ham band condition now
  357. Ham bands conditions
  358. Ham band map
  359. Ham band propagation map
  360. Ham band status
  361. Ham bands' activity
  362. Ham propagation map
  363. Ham radio atmospheric conditions
  364. Ham radio bands and frequencies
  365. Ham radio band conditions
  366. Ham radio band conditions app
  367. Ham radio band conditions map
  368. Ham radio band conditions today
  369. Ham Radio Band Frequencies
  370. Ham Radio Bands: Frequencies and Characteristics
  371. Ham radio basics: Beginners guide to HF radio propagation
  372. Ham radio charts
  373. Ham radio condition charts
  374. Ham radio conditions
  375. Ham radio condition maps
  376. Ham radio current conditions
  377. Ham Radio Dead Bands
  378. Ham radio DX live streaming
  379. Ham radio DX map
  380. Ham radio for Beginners
  381. Ham radio for Newbees
  382. Ham radio for Newbeis
  383. Ham radio frequency chart
  384. Ham radio frequencies
  385. Ham Radio Guide for HF propagation
  386. Ham radio HF band conditions
  387. Ham radio HF conditions
  388. Ham radio HF propagation real-time
  389. Ham radio propagation
  390. Ham radio propagation app
  391. Ham radio propagation conditions
  392. Ham radio propagation forecast
  393. Ham radio propagation forecasts
  394. Ham radio propagation frequencies
  395. Ham radio propagation live map
  396. Ham radio propagation overview
  397. Ham radio propagation map
  398. Ham radio propagation now
  399. Ham radio propagation prediction
  400. Ham radio propagation real-time
  401. Ham radio propagation review
  402. Ham radio propagation: Solar conditions
  403. Ham radio propagation today
  404. Ham radio propagation tutorial
  405. Ham radio propagation websites
  406. Ham Radio Range Guide
  407. Ham Radio Range Guide: How Far Can You Talk?
  408. Ham Radio Range: How Far Can You Talk With It?
  409. Ham radio solar activity
  410. Ham radio solar conditions
  411. Ham radio solar cycle
  412. Ham radio solar weather
  413. Ham radio space weather
  414. Ham radio websites
  415. Ham radio websites about forcasing HF propagation
  416. Ham radio sun conditions
  417. Ham radio sunspot
  418. Ham radio sunspot conditions
  419. Ham radio sunspots now
  420. Ham radio wave propagation
  421. Ham Solar
  422. Ham solar conditions
  423. HamSCI Space Weather Operational Resources and Needs of the Amateur Radio Community (2020)
  424. Heliophysics
  425. Heliophysics and Amateur Radio
  426. Heliosphere
  427. Heliospheric Current Sheet (HCS)
  428. Helioviewer
  429. Helium lines
  430. HF—High frequency
  431. HF bands affected by solar conditions
  432. HF bands allocated for radio amateurs
  433. HF bands allocated for radio amateurs and their characteristics
  434. HF bands allocated for radio amateurs and their features
  435. HF bands assigned to hams
  436. HF bands assigned to radio amateurs
  437. HF band conditions
  438. HF band conditions maps
  439. HF band conditions Regional
  440. HF Band conditions: A Comprehensive Guide
  441. HF Bands Ham Radio Guide
  442. HF bands open now
  443. HF band propagation chart
  444. HF bands monitoring
  445. HF communication
  446. HF communication prediction tools
  447. HF conditions Regional
  448. HF conditions at a glance
  449. HF critical frequency
  450. HF DXView
  451. HF frequency range
  452. HF open now
  453. HF prediction | HF propagation
  454. HF propagation — The basics
  455. HF Propagation and the Ionosphere
  456. HF propagation and solar-terrestrial data
  457. HF propagation app
  458. HF propagation applications
  459. HF propagation basics
  460. HF propagation blackout
  461. HF propagation calculator
  462. HF propagation chart
  463. HF propagation conditions
  464. HF Propagation Conditions: Forecasting and Prediction
  465. HF propagation conditions at a glance
  466. HF propagation data app
  467. HF propagation data seasons
  468. HF propagation data study
  469. HF propagation disruptions AU
  470. HF propagation disruptions UK
  471. HF propagation disruptions US
  472. HF propagation experts
  473. HF propagation explained
  474. HF propagation explanation
  475. HF propagation fadeouts
  476. HF propagation fluctuations
  477. HF propagation for advanced hams
  478. HF Propagation for Amateurs
  479. HF propagation for beginners
  480. HF propagation for beginners and advanced
  481. HF Propagation for Ham Radio Explained
  482. HF propagation for newbees
  483. HF Propagation for Amateurs
  484. HF Propagational Resources
  485. HF propagation for radio amateurs
  486. HF propagation for radio hams
  487. HF propagation forecast
  488. HF propagation forecast
  489. HF propagation forecast applications
  490. HF propagation forecast for radio amateurs
  491. HF propagation forecast tools
  492. HF Propagation Forecasting
  493. HF propagation fundamentals
  494. HF propagation guide
  495. HF propagation guide for radio hams
  496. HF propagation indicators
  497. HF propagation ionospheric disturbances
  498. HF propagation live chart
  499. HF propagation live map
  500. HF propagation map
  501. HF propagation map google
  502. HF propagation models
  503. HF propagation modes
  504. HF propagation modes overview
  505. HF propagation now (real-time)
  506. HF propagation online map
  507. HF propagation online reports
  508. HF propagation overview
  509. HF propagation prediction
  510. HF propagation prediction based on real-time DX reports
  511. HF propagation prediction online
  512. HF propagation prediction software
  513. HF propagation predictions
  514. HF propagation preface
  515. HF propagation reporter
  516. HF propagation reports
  517. HF propagation shortcast overview
  518. HF propagation shortcast review
  519. HF propagation score
  520. HF propagation shortcasts a folder of brief podcasts less than 15 minutes
  521. HF Propagation software review
  522. HF Propagation solar indicators
  523. HF propagation status
  524. HF propagation tools
  525. HF propagation tutorials
  526. HF propagation tutorial for radio amateurs
  527. HF propagation tutorials
  528. HF propagation today
  529. HF propagation tools
  530. HF propagation widget
  531. HF radio propagation | HF radio propagation seasons
  532. HF radio propagation app
  533. HF radio propagation bands
  534. HF radio propagation basics
  535. HF radio propagation chart
  536. HF radio communication
  537. HF radio propagation during a solar storm
  538. HF radio propagation conditions
  539. HF radio propagation for beginners
  540. HF radio propagation forecast
  541. HF radio propagation indices and scales
  542. HF propagation map Nowcast
  543. HF radio propagation map Explanations
  544. HF radio propagation modes
  545. HF radio propagation now
  546. HF radio propagation today
  547. HF radio propagation prediction | HF radio propagation prediction compared to forecast
  548. HF radio propagation tutorial for radio amateurs
  549. HF propagation widget
  550. HF radio conditions
  551. HF radio propagation
  552. HF radio propagation forecast
  553. HF radio propagation maps
  554. HF radio propagation software
  555. HF radio propagation today
  556. HF radio wave propagation
  557. HF radio waves (basics)
  558. HF radio wave propagation factors
  559. HF real-time propagation
  560. HF signals propagation
  561. HF skywave communication
  562. HF skywave window: LUF—MUF
  563. HF space weather
  564. HF wave propagation
  565. HFTA - High frequency Terrain Assessment
  566. High frequency communications response to solar activity
  567. High frequency propagation software
  568. High frequency radio propagation
  569. Highest frequency bands at night
  570. Highest Possible Frequency (HPF)
  571. History of amateur radio
  572. How are HF conditions determined?
  573. How are ionospheric conditions measured?
  574. How can I monitor HF bands without having a good receiver and antenna?
  575. How can I operate during solar storms?
  576. How can I use my PC as a ham band monitor?
  577. How can propagation reports help ham radio operators
  578. How can we forecast changes in HF conditions over the next hour?
  579. How can we forecast HF propagation conditions?
  580. How do disturbances such as solar flares, geomagnetic storms, and traveling ionospheric disturbances affect radio wave propagation?
  581. How do geomagnetic storms affect radio wave propagation?
  582. How do I find out what bands are open?
  583. How do ionospheric disturbances affect radio wave propagation?
  584. How do radio waves bounce off the ionosphere for long-distance communication?
  585. How do radio waves propagate?
  586. How do radio waves travel through the Earth's atmosphere?
  587. How do solar flares affect radio wave propagation?
  588. How do solar flares cause geomagnetic storms?
  589. How do solar storms affect radio propagation?
  590. How do solar storms cause geomagnetic storms?
  591. How do the seasons affect HF radio propagation?
  592. How do traveling ionospheric disturbances affect radio wave propagation?
  593. How do you read HF band conditions?
  594. How do we monitor space weather?
  595. How does Geomagnetic activity affect HF propagation?
  596. How does elevation affect HF propagation?
  597. How does HF propagation work?
  598. How Does Ionospheric propagation take place?
  599. How Does Ionospheric propagation work?
  600. How does HF radio propagate?
  601. How Does Radio Waves Compare to Visible Light?
  602. How does the ionosphere affect HF radio propagation?
  603. How does the ionosphere affect radio wave propagation?
  604. How does the ionosphere couple with the neutral atmosphere and with space?
  605. How does the ionosphere respond to inputs from space and from the neutral atmosphere?
  606. How does the sun affect radio communication?
  607. How far can 40m band go? How far can you talk on a 10-meter band?
  608. How far can a ham radio reach?
  609. How far can ham radio talk?
  610. How far can HF radio go?
  611. How far can HF radio transmit?
  612. How far can I communicate?
  613. How far can I talk?
  614. How far can I talk with my ham radio?
  615. How far can you talk on ham radio?
  616. How far will a radio transmit?
  617. How solar storms affect ham radio propagation
  618. How to assess propagation?
  619. How to choose antenna?
  620. How to choose ham band based on propagation conditions?
  621. How to determine HF propagation conditions?
  622. How to determine if a band is open?
  623. How to improve HF communication frequency selection ability?
  624. How to know if a band is open?
  625. How to predict MUF?
  626. How to read HF band conditions?
  627. How to use a remote HF radio receiver?
  628. How will a solar storm affect my ham radio activities?
  629. HPF—Highest Possible Frequency
  630. Hybrid ionospheric models
  631.  
    I
  632. IMF - Interplanetary Magnetic field
  633. Incident angle
  634. Impacts of space weather
  635. Impacts of space weather on HF radio communications
  636. Impact of the sun
  637. Index of refraction—Glass's refractive index in comparison to plasma/ionosphere
  638. Interplanetary magnetic field (IMF)
  639. Interpretation of the propagation indices
  640. Introduction to HF propagation
  641. Introduction to HF Radio Propagation Australian Gov (2002)
  642. Introduction to-HF Radio Propagation Australian Gov (2007)
  643. Ionospheric Propagation, Prof. Sean Victor Hum (2018)
  644. Ionospheric propagation frequency range
  645. Ionospheric Radio Propagation, Kenneth Davies (1965)
  646. Introduction to ionospheric propagation
  647. Introduction to RF propagation
  648. Ionisation
  649. Ionization
  650. IonoProbe
  651. Ionogram
  652. Ionograms (references — list of sources)
  653. Ionosonde
  654. Ionosondes (references — list of sources)
  655. Ionosondes HF propagation
  656. ionosphere
  657. Ionosphere — HF radio propagation; Multi-refractions; free electron density and Geomagnetic storms
  658. Ionosphere and HF
  659. Ionosphere and radio signals
  660. Ionosphere and skywave propagation; Ionization of D, E and F regions | Free-electron density | Skywaves
  661. Ionosphere at night
  662. Ionosphere dynamics
  663. Ionosphere is a part of which layer of atmosphere?
  664. Ionosphere is also known as...
  665. Ionosphere layers diagram
  666. Ionosphere probing
  667. Ionosphere propagation
  668. Ionosphere regions
  669. Ionosphere temperature
  670. Ionosphere understanding
  671. Ionosphere, radio waves
  672. Ionosphere, space weather and radio propagation
  673. Ionosphere’s influence
  674. Ionospheric absorption
  675. Ionospheric anomalies (references — list of sources)
  676. Ionospheric bubbles
  677. Ionospheric clouds
  678. Ionospheric conditions | Ionospheric conditions
  679. Ionospheric data
  680. Ionospheric dispertion of radio waves
  681. Ionospheric distortion
  682. Ionospheric disturbances
  683. Ionospheric disturbances and HF propagation conditiona
  684. Ionospheric disturbances and their impacts on HF radio wave propagation
  685. Ionospheric disturbances probing (references — list of sources)
  686. Ionospheric dynamics
  687. Ionospheric effects on hf radio wave propagation
  688. Ionospheric interference
  689. Ionospheric irregularities
  690. Ionospheric models (references — list of sources)
  691. Ionospheric monitoring and HF frequency management
  692. Ionospheric prediction and HF frequency management
  693. Ionospheric propagation
  694. Ionospheric propagation chart
  695. Ionospheric propagation map
  696. Ionospheric propagation examples
  697. Ionospheric propagation model
  698. Ionospheric propagation of radio waves
  699. Ionospheric propagation of radio waves explained
  700. Ionospheric propagation theory
  701. Ionospheric radio propagation
  702. Ionospheric reflection (resources)
  703. Ionospheric refraction (resources)
  704. Ionospheric radio propagation
  705. Ionospheric regions
  706. Ionospheric regions (references — list of sources)
  707. Ionospheric regions and HF Skywaves
  708. Ionospheric research (references — list of sources)
  709. Ionospheric skywave propagation
  710. Ionospheric storms
  711. Ionospheric variations (references — list of sources)
  712. Is HF propagation reciprocal?
  713. IRI ionospheric model
  714. ITU model
  715.  
    J
  716. John Ashworth Aatcliffe (12-December-1902-25-October 1987)
  717.  
    K
  718. KC2G HF MUF propagation maps
  719. Keep an Eye on the High Bands
  720. Key aspects of radio propagation for hams
  721. Key concepts of HF propagation
  722. Key factors affecting HF propagation
  723. Key for HF Propagation Charts
  724. K-Index
  725. K-index Australia
  726. K-index United Kingdom
  727. K-index United States
  728. Kp index
  729. Kp index Aurora
  730. Kp Index Explained
  731. Kp index Nowcast
  732. KiwiSDR map of remote public SDR receivers accessible via the Internet
  733.  
    L
  734. Lagrange points
  735. Latest HF Bands Propagation
  736. Layers or regions of the ionosphere?
  737. Learning about space weather
  738. Line-Of-Sight propagation (LOS)
  739. Live ham radio map
  740. Live HF propagation
  741. Live HF Propagation Charts and Maps
  742. Live HF propagation map
  743. Live radio propagation map
  744. Live solar activity
  745. Live solar alerts
  746. Live solar events and past solar activity
  747. Listen live ham radio
  748. LOS
  749. LOS - Line of sight propagation
  750. Long and mid-range skywaves
  751. Long distance communication
  752. Lowest & Maximum Usable Frequency, Critical Frequency
  753. Lowest usable frequecy (LUF)
  754. Lowest Usable Frequency map
  755. LUF frequency range due to SID
  756. LUF frequency range chart
  757. LUF (Lowest Usable frequency)
  758. LUF chart
  759. LUF chart for radio amateurs
  760. LUF map
  761. LUF Propagation Map
  762.  
    M
  763. Magic band openings
  764. Magnetic field
  765. Magnetosphere (MS)
  766. Making sense of solar indices
  767. Mastering HF propagation
  768. Maximum usable frequency (MUF)
  769. Maximum Usable frequency map
  770. Methods for forecasting band conditions
  771. Methods for monitoring HF propagation
  772. Methodes to forecast radio propagation
  773. Minimum usable frequecy—The lowest usable frequency (LUF)
  774. Model evaluation
  775. Model validation
  776. Model verification
  777. Modeling the Topside Ionosphere Observations by Satellites (2003)
  778. Models
  779. Modes of HF radio propagation
  780. Modes of radio propagation
  781. Modes of Radio Wave Propagation in Wireless Communication
  782. Monitor band activity of radio amateurs
  783. Monitoring HF band activity
  784. Moniotring HF propagation
  785. Monitoring solar flux levels for promising band openings
  786. MS — Meteor Scatter Activity
  787. MUF | Maximum Usable Frequency
  788. MUF(3000)F2 plots
  789. MUF 3000 km map
  790. MUF and LUF
  791. MUF calculation
  792. MUF calculator
  793. MUF factor
  794. MUF ham radio
  795. MUF indicators
  796. MUF LUF FOT
  797. MUF LUF prediction
  798. MUF map
  799. MUF map real time
  800. MUF maps and charts
  801. MUF meaning
  802. MUF propagation
  803. MUF propagation chart
  804. MUF propagation map
  805. MUF propagation online map
  806. MUF radio propagation
  807. MUF radio propagation map
  808. MUF, LUF, and FOT
  809.  
    N
  810. Near real-time HF propagation charts
  811. Near real-time F2-region critical frequency map
  812. Near real-time regional maps
  813. Near real-time skywave propagation charts
  814. Near Vertical Incidence Skywave
  815. NET ionospheric model
  816. NM7M’s-HF-Propagation-tutorial-2015-by-Thierry-Lombry,-LX4SKY (txt file)
  817. NM7M HF Propagation tutorial
  818. NOAA
  819. NOAA predicted sunspot number
  820. NOAA Radio dashboard
  821. NOAA solar cycle
  822. NOAA solar flux predictions
  823. NOAA sunspot cycle predictions
  824. NOAA SWPC space weather scales
  825. Noise level
  826. Nowcast HF propagation conditions
  827. Number of radio amateurs by country
  828. NVIS
  829. NVIS antenna
  830. NVIS map
  831. NVIS propagation
  832. NVIS propagation concept
  833. NVIS propagation maps
  834. NVIS tutorial
  835. NVIS: Stephen C. Finch AI0W (2008)
  836.  
    O
  837. Observations - Geo (Terrestrial) & Solar
  838. Observations and Modeling of Traveling Ionospheric Disturbances
  839. On-line HF Propagation Prediction
  840. Online chart of the recent LUF
  841. Online HF propagation prediction
  842. Online indices
  843. Online LUF chart
  844. Online LUF map
  845. Online propagation charts
  846. Online HF propagation prediction
  847. Online propagation tools
  848. Online real-time propagation charts
  849. Optical dispertion of light vs Ionospheric dispertion of radio waves
  850. Optimal sending frequency
  851. Optimum traffic frequency (OTF)
  852. Optimum transmission frequency (OTF)
  853. Optimizing HF bands: Frequency, Propagation, and Time-of-Day
  854. OWF — Optimum Working frequency
  855.  
    P
  856. Past solar activity
  857. PCA (polar cap absorption)
  858. Physics of Propagation - Refraction Absorption Polarization
  859. Plasma
  860. Plasma clouds
  861. Polar cap absorption (PCA)
  862. PSKR, WSPR
  863. Practical applications
  864. Practical approach
  865. Practical guide
  866. Predict conditions
  867. Predict HF propagation radio propagation
  868. Predict MUF
  869. Predict propagation
  870. Predict skywave propagation—nowcast
  871. Predict solar flux
  872. Predict space weather
  873. Predict sunspot numbers
  874. Prediction of sky-wave propagation conditions
  875. Predicting HF Band Conditions for Ham Radio
  876. Predicting HF propagation
  877. Predicting ionospheric conditions
  878. Predicting propagation
  879. Predicting propagation of skywave
  880. Predicting radio propagation
  881. Predicting skywave propagation
  882. Predicting solar flares
  883. Predicting solar flux
  884. Prediction
  885. Prediction vs forecast of HF band conditions
  886. Principles of radio wave propagation
  887. Probing ionospheric disturbances (references — list of sources)
  888. Propagation
  889. Propogation and RadioScience, KL7AL (ARRL 2005)
  890. Propagation and Sun
  891. Propagation beginner's guide
  892. Propagation characteristics of radio waves
  893. Propagation characteristics analysis of high-frequency radio waves
  894. Propagation HF prediction
  895. Propagation indicators
  896. Propagation indicators: foF2, MUF, OWF, LUF
  897. Propagation indices
  898. Propagationmodes of HF radio propagation
  899. Propagation charts for ham radio
  900. Propagation condition map
  901. Propagation conditions
  902. Propagation DX
  903. Propagation explained
  904. Propagation factors & conditions
  905. Propagation forecast
  906. Propagation forecast for HF radio
  907. Propagation forecast methodes
  908. Propagation forecasts for radio amateurs
  909. Propagation guide for radio hams
  910. Propagation indices (plural of propagation index)
  911. Propagation live map
  912. Propagation map
  913. Propagation map for ham radio
  914. Propagation maps for ham radio
  915. Propagation modes
  916. Propagation Modes, Ken Larson, KJ6RZ (2024)
  917. Propagation of HF radio waves
  918. Propagation of radiowaves
  919. Propagation of radio waves
  920. Propagation of radio waves explained
  921. Propagation of RF Signals
  922. Propagation of high frequency radio waves — The rebirth of HF
  923. Propagation of radio waves for beginners
  924. Propagation of shortwave radio
  925. Propagation of short radio waves
  926. Propagation online map
  927. Propagation Overview 48-Hour
  928. Propagation prediction
  929. Propagation prediction programs and forecasts
  930. Propagation Prediction Tool
  931. Propagation prediction tools
  932. Propagation reports
  933. Propagation report ham radio
  934. Propagation reports for Ham radio
  935. Propagation software
  936. Propagation tools for ham radio
  937. Propagation tools to help succeed with your ham radio
  938. Propagation Tutorial | Table of contents
  939. Propagation visualization
  940. Properties of electromagnetic waves
  941. Properties of radio waves
  942. Proton flux (Pf)
  943. PSKR - PSK reporter
  944.  
    Q
  945. QSL net propagation
  946. QSO Activity reports
  947. Quick guide to HF propagation using solar indices
  948. Quiet sun
  949.  
    R
  950. R-S-G Scales defined
  951. R-S-G Scales now
  952. R1-R5: Scale of Radio blackouts
  953. Radio Amateur
  954. Radio blackout
  955. Radio blackout effects
  956. Radio blackout map
  957. Radio blackout phenomenon
  958. Radio blackout today
  959. Radio blackouts
  960. Radio amateurs HF bands charactaristics
  961. Radio blackouts due to solar storms
  962. Radio blackout events during 2024
  963. Radio communication and the ionosphere
  964. Radio communications dashboard
  965. Radio fadeouts
  966. Radio frequency
  967. Radio frequency chart
  968. Radio frequency range chart
  969. Radio frequency ranges chart
  970. Radio frequency table
  971. Radio frequency use chart
  972. Radio frequency and Ionosphere
  973. Radio frequency propagation
  974. Radio frequency propagation
  975. Radio frequency propagation: A comprehensive beginner’s guide
  976. Radio frequency propagation for Ham radio
  977. Radio frequency propagation: A Comprehensive Guide
  978. Radio ham bands live
  979. Radio ham HF band conditions
  980. Radio propagation
  981. Radio propagation - what is it?
  982. Radio propagation and space weather
  983. Radio propagation basics
  984. Radio propagation beacon
  985. Radio propagation charts
  986. Radio propagation conditions map
  987. Radio propagation data map
  988. Radio propagation explained
  989. Radio propagation forecast
  990. Radio propagation forecasting
  991. Radio propagation formula
  992. Radio propagation free software
  993. Radio propagation frequency
  994. Radio propagation levels map
  995. Radio propagation live map
  996. Radio propagation maps
  997. Radio propagation model
  998. Radio propagation modeling
  999. Radio Propagation Prediction
  1000. Radio propagation prediction for HF communications
  1001. Radio propagation prediction vs. foracasting
  1002. Radio propagation prediction modelling
  1003. Radio Propagation Online Tools
  1004. Radio Propagation Overview
  1005. Radio Propagation Overview Recent 48-Hours
  1006. Radio propagation properties
  1007. Radio propagation software
  1008. Radio propagation today
  1009. Radio propagation tool
  1010. Radio propagation tutorials for radio amateurs
  1011. Radio spectrum
  1012. Radio wave
  1013. Radio Wave fundamentals
  1014. Radio wave principles
  1015. Radio wave propagation
  1016. Radio wave propagation
  1017. Radio wave propagation fundamentals
  1018. Radio wave propagation guide
  1019. Radio wave propagation in the ionosphere
  1020. Radio wave propagation model
  1021. Radio Wave Propagation part-1 Introduction, Marcel H. De-Canck, ON5AU (2002)
  1022. Radio wave propagation tutorial
  1023. Radio wave HF propagation models
  1024. Radio wave characteristics
  1025. Radio wave propagation charactaristic
  1026. Radio wave propagation forecasting
  1027. Radio wave propagation in the ionosphere
  1028. Radio wave propagation today
  1029. Radio wave transmission
  1030. Radio waves
  1031. Radio waves and the ionosphere (effetcs) | Radio waves and the Ionosphere (structure, regions)
  1032. Radio Waves and the Ionosphere, G3YWX (QST 1999)
  1033. Radio waves examples
  1034. Radio waves nature and properties
  1035. Radio waves overview
  1036. Radio waves properties
  1037. Radio wave spectrum
  1038. Radio-wave propagation modes
  1039. Radiowave Propagation
  1040. Ray tracing models
  1041. Ray tracing Optics
  1042. RBN - Reverse beacon Network
  1043. Real time activity of radio amateurs
  1044. Real time band conditions
  1045. Real time band conditions for ham radio
  1046. Real time data
  1047. Real time DX data
  1048. Real time DX propagation conditions
  1049. Real time DX reports * HF propagation prediction
  1050. Real time forecast of HF radio propagation
  1051. Real time ham band activity using the internet
  1052. Real time HF band conditions
  1053. Real time HF DX Propagation Prediction
  1054. Real time HF propagation charts
  1055. Real time HF propagation maps
  1056. Real time HF propagation prediction
  1057. Real time HF propagation reports
  1058. Real-time ionogram
  1059. Real time MUF 3000 km propagation map
  1060. Real time MUF map
  1061. Real time propagation and band conditions
  1062. Real time propagation charts
  1063. Real time propagation charts for HF radio
  1064. Real time propagation conditions
  1065. Real time propagation map
  1066. Real time radio propagation map
  1067. Real time radio propagation reports
  1068. Real time reports HF propagation
  1069. Real time reports of space weather
  1070. Realtime skywave propagation reports
  1071. Real time solar flare
  1072. Real time space weather reports
  1073. Real time space weather reports—Explanation
  1074. Real time sunspots number
  1075. Real time watching of worldwide ham activity
  1076. Real time watching of worldwide hams' activity
  1077. Recent geomagnetic storms
  1078. Recent geophysical & solar observations
  1079. Recent Kp
  1080. Recent MUF distribution
  1081. Recent observations - Geo (Terrestrial) & Solar
  1082. Recent propagation conditions
  1083. Recent R-S-G reports
  1084. Recent solar flares
  1085. Recent sunspots number
  1086. Reciprocal HF propagation
  1087. Refraction of radio wave compared to visible light
  1088. Refractive index maps
  1089. Refractive index of HF radio in the ionosphere
  1090. Regional and global online reports of HF propagation
  1091. Regional conditions
  1092. Regional HF conditions
  1093. Regional MUF and solar indices
  1094. Regional propagation
  1095. Regional Variations
  1096. Regional vs Global HF propgation conditions
  1097. Regional vs Global propgation conditions
  1098. Regions of ionization
  1099. Region vs. Layer: Earth's Atmosphere and Ionosphere
  1100. Remote sensing of the ionosphere
  1101. Remote receivers, WebSDR and KiwiSDR
  1102. Report skywave erratic propagation conditions
  1103. Reports of space weather
  1104. Reports of Space Weather Conditions
  1105. Resources for Predicting HF Band Conditions for Ham Radio
  1106. RSG scales of Space Weather
  1107.  
    S
  1108. Satellites for space weather observations
  1109. S1-S5 - scale of Solar radiation storms
  1110. SDO - Solar Dynamic Obervatory (NASA)
  1111. SDR - Software Defined radio
  1112. SDR spectrum
  1113. Seasonal Effects on propagation
  1114. Seasonal phenomena
  1115. Seasonal variations in HF radio propagation
  1116. Seasons affect HF radio propagation
  1117. Selecting techniques for HF radio communication
  1118. SEP
  1119. Severe geomagnetic storm
  1120. SFI
  1121. SFI today
  1122. SFU
  1123. Short Wave propagation
  1124. Shortwave Band Characteristics
  1125. Shortwave listening (SWL)
  1126. Shortwave radio frequencies — chart
  1127. Shortwave propagation
  1128. Shortwave propagation conditions
  1129. Shortwave propagation conditions map
  1130. Shortwave propagation forecast
  1131. Shortwave propagation map
  1132. Shortwave propagation prediction
  1133. Shortwave radio propagation
  1134. Shortwave radio propagation today
  1135. SID - Sudden ionospheric disturbances
  1136. Significance of solar activity for amateur radio
  1137. Significant frequencies relevant to skywaves
  1138. Significat radio blackout events during 2024
  1139. Simple Ham radio
  1140. Skip distance | Skip distance—Skywave
  1141. Skip zone
  1142. Skip zone and skip distance
  1143. Sky propagation advantages
  1144. Sky propagation critical frequencies
  1145. Sky propagation diagram
  1146. Sky wave propagation
  1147. Sky wave propagation diagram
  1148. Sky wave propagation example
  1149. Sky wave propagation frequency range
  1150. Sky wave propagation pdf
  1151. Skywave
  1152. Skywave concept
  1153. Skywave frequencies to listen to
  1154. Skywave HF radio propagation
  1155. Skywave multi-refractions
  1156. Skywave propagation dynamics
  1157. Skywave propagation—AI generated shortcast courtesy of Jean-Paul Suijs, PA9X
  1158. Skywave propagation basics
  1159. Skywave propagation conditions
  1160. Skywave propagation example
  1161. Skywave propagation for radio amateurs
  1162. Skywave propagation forecast
  1163. Skywave propagation frequency range
  1164. Skywave propagation indices
  1165. Skywave propagation mathematical models
  1166. Skywave propagation review pdf
  1167. Skywave propagation pdf
  1168. Skywave propagation references
  1169. Skywave propagation review
  1170. Skywave propagation secrets
  1171. Skywave propagation tutorial
  1172. Skywave propagation—What is it?
  1173. Software for HF propagation prediction
  1174. Solar activity
  1175. Solar Activity associated with HF radio propagation on earth
  1176. Solar Activity & Ham radio propagation
  1177. Solar Activity & HF propagation
  1178. Solar activity affects HF propagation
  1179. Solar activity affects skywaves
  1180. Solar activity and HF propagation
  1181. Solar activity and the ionosphere
  1182. Solar activity chart over time
  1183. Solar activity cycle chart
  1184. Solar activity for radio amateurs
  1185. Solar activity forecast
  1186. Solar activity prediction
  1187. Solar activity radio propagation
  1188. Solar conditions & ham propagation
  1189. Solar conditions affect HF radio propagation
  1190. Solar conditions and ham propagation
  1191. Solar conditions and ham radio propagation
  1192. Solar conditions and HF radio propagation
  1193. Solar conditions for radio propagation
  1194. Solar cycle
  1195. Solar Cycle Ham radio
  1196. Solar cycle radio amateur propagation
  1197. Solar Cycle, status and progression
  1198. Solar data
  1199. Solar dynamics
  1200. Solar Electromagnetic Spectrum
  1201. Solar energetic Particle (SEP)
  1202. Solar events
  1203. Solar events live
  1204. Solar flare alert
  1205. Solar flare chart
  1206. Solar flare forecast
  1207. Solar flare history chart
  1208. Solar flare interference comparison
  1209. Solar flare radiation
  1210. Solar flare radiation graph
  1211. Solar flare warning
  1212. Solar flares
  1213. Solar flares and HF fadeouts
  1214. Solar flares and HF Propagation
  1215. Solar flares and propagation
  1216. Solar flares and Radio blackouts
  1217. Solar flares hitting earth today
  1218. Solar flares today alerts warnings
  1219. Solar flares classification chart
  1220. Solar flux
  1221. Solar flux chart for today
  1222. Solar Flux Index (SFI)
  1223. Solar flux index chart
  1224. Solar flux indices: SF, SSN
  1225. Solar flux index today
  1226. Solar flux outlook
  1227. Solar Flux Today
  1228. Solar flux value for today
  1229. Solar Flux versus Sunspot Activity
  1230. Solar Flux, Sunspots, and Ionizing Radiation
  1231. Solar Ham
  1232. Solar Indices: SSN, Solar Flux
  1233. Solar indices and space weather | Solar Indices Explained
  1234. Solar indices today
  1235. Solar indices what are they?
  1236. Solar index propagation chart
  1237. Solar index today
  1238. Solar maximum
  1239. Solar minimum
  1240. Solar observations
  1241. Solar Particle event (SPE)
  1242. Solar phenomena
  1243. Solar propagation ham radio
  1244. Solar radiation
  1245. Solar radio flux
  1246. Solar Radio Interference
  1247. Solar Region Data - SunSpots
  1248. Solar spectra
  1249. Solar storm ham radio
  1250. Solar storm radio amateur
  1251. Solar storm today
  1252. Solar storm warning today
  1253. Solar storms (X-ray flares and particle events)
  1254. Solar storms overview
  1255. Solar storms consist of solar flares and Coronal Mass Ejections (CME)
  1256. Solar storm FAQs: Your top amateur radio questions answered?
  1257. Solar storms ham radio
  1258. Solar synoptic map
  1259. Solar terminator (i.e. Greyline)
  1260. Solar terrestrial activity report
  1261. Solar Terrestrial Data
  1262. Solar terrestrial data explained
  1263. Solar UV and X-ray spectral diagnostics (2018)
  1264. Solar weather info
  1265. Solar weather reports
  1266. Solar wind
  1267. Solar wind Ham radio
  1268. Solar wind real-time dials
  1269. Solar wind reports
  1270. Solar X-Ray (Phenomenon)
  1271. Solar X-ray Imaging system (SXI)
  1272. Solar X-Ray flux levels
  1273. SolarWx
  1274. Space wave
  1275. Space weather a comprehensive tutorial
  1276. Space weather agencies & services Worldwide
  1277. Space weather and amateur radio
  1278. Space weather and propagation
  1279. Space weather and radio communications
  1280. Space weather and radio propagation
  1281. Space weather by solar ham
  1282. Space weather data and plots
  1283. Space weather effects on communication systems
  1284. Space weather effects on communications systems (June 2020)
  1285. Space weather events
  1286. Space weather for Amateur Radio
  1287. Space weather forecast
  1288. Space weather for radio hams
  1289. Space weather forecasting
  1290. Space weather ground-based observatories
  1291. Space weather ham radio
  1292. Space Weather HF propagation
  1293. Space Weather HF Radio propagation
  1294. Space weather live
  1295. Space weather models
  1296. Space weather needs of the amateur radio community
  1297. Space weather news
  1298. Space Weather Nowcast
  1299. Space weather observations
  1300. Space weather observations from satellites
  1301. Space weather overview
  1302. Space weather phenomena
  1303. Space weather prediction
  1304. Space Weather Prediction Center (NOAA)
  1305. Space weather predictions for radio amateurs
  1306. Space weather reports
  1307. Space weather reports
  1308. Space weather scales
  1309. Space weather: real-time 24hr effective sunspot number
  1310. SPE
  1311. Sporadic E (Es)
  1312. Sporadic E multipath
  1313. Sporadic E propagation
  1314. Spread F
  1315. Sprites
  1316. SSN
  1317. Stanley article of the month (QST-June-2021)
  1318. Stratosphere
  1319. Sudden Ionospheric Disturbances (SID)
  1320. Summary
  1321. Sun flare propagation
  1322. Sun flare radiation
  1323. Sun spots ham radio today
  1324. Sunspot index correlation
  1325. Sunspot number
  1326. Sunspot numbers explained
  1327. Sunspots
  1328. Sunspots and HF propagation
  1329. Sunspots and skywave propagation
  1330. Sunspots and solar flares
  1331. Sunspots and sun flare
  1332. Sunspots and solar flux
  1333. Sunspots and the ionosphere
  1334. Sunspots ham radio today
  1335. Sunspots NOAA predicted sunspot number
  1336. Sunspots number
  1337. Sunspots number today
  1338. Sunspots explained
  1339. Sunspots
  1340. Sunspots and solar flux
  1341. Sunspot cycle
  1342. Sunspot number
  1343. SuperDARN
  1344. Sunlight
  1345. Sunspot cycles
  1346. Sunspot index since 1750
  1347. Sunspot index and long-term solar observations
  1348. Sunspot number and radio flux
  1349. Sunspot number forecast
  1350. Sunspot number prediction
  1351. Sunspot propagation chart
  1352. Sunspot propagation effects
  1353. Sunspots recent days
  1354. Sunspot solar cycle 25
  1355. Sunspots today
  1356. Surface wave propagation
  1357. SWPC = Space Weather prediction center (NOAA)
  1358.  
    T
  1359. T Index map
  1360. Table of frequency allocations chart
  1361. TEC - Total electron content
  1362. Terminator line
  1363. Terrestrial geomagnetic indices
  1364. Terrestrial observations
  1365. The Big Gun`s Guide to Low Band Propagation: A book by NM7M (2002)
  1366. The current propagation conditions
  1367. The decline and comeback of skywave HF radio
  1368. The effects of weather on amateur radio propagation
  1369. The effective ham radio range
  1370. The electromagnetic spectrum
  1371. The HF bands assigned to hams
  1372. The HF bands assigned to radio amateurs
  1373. The HF bands for newcomers
  1374. The impact of geomagnetic storms on HF propagation
  1375. The importance of frequency management in HF radio communications
  1376. The influence of ionospheric electron density fluctuations on HF propagation
  1377. The ionosphere
  1378. The ionosphere and HF propagation
  1379. The Little Pistol's Guide to HF Propagation Robert R. Brown, Worldradio Books (1996)
  1380. The lowest usable frequecy
  1381. The Magic of Aurora
  1382. The magnetosphere
  1383. The maximum range of ham radios
  1384. The propagation of radio waves
  1385. The radio spectrum
  1386. The Rebirth of Shortwave radio communication
  1387. The rebirth of skywave HF radio
  1388. The recent propagation conditions
  1389. The recent sunspots number
  1390. The relationships between sunspot number and solar radio flux at 10.7 centimeters
  1391. The science behind radio wave propagation
  1392. The solar cycle | SSN Explained
  1393. The solar cycle and sunspots
  1394. The Sun and space weather
  1395. The Super Dual Auroral Radar Network (SuperDARN)
  1396. The Structure of the Ionosphere
  1397. Theory-Based Tutorial on HF Propagation
  1398. Thermosphere
  1399. TID (Traveling ionospheric disturbances)
  1400. Total Electron Content (TEC)
  1401. Tools & Applications
  1402. Tools for analyzing and forecasting HF propagation
  1403. Total electron content — TEC
  1404. Tracking digital modes
  1405. Tracking global beacons
  1406. Transmission Angle
  1407. Traveling ionospheric disturbances (TID)
  1408. Transient Luminous Events (TLEs)
  1409. Troposphere
  1410. Twilight zone
  1411. Types of radio wave propagation
  1412.  
    U
  1413. Ultraviolet
  1414. Understanding Amateur Radio Bands
  1415. Understanding Amateur Radio NVIS
  1416. Understanding Geomagnetic Indices
  1417. Understanding Ham bands conditions banner
  1418. Understanding Ham radio propagation
  1419. Understanding HF propagation
  1420. Understanding HF Propagation Review
  1421. Understanding HF propagation banners
  1422. Understanding HF propagation
  1423. Understanding HF Propagation for radio hams
  1424. Understanding HF propagation numbers
  1425. Understanding HF propagation practice
  1426. Understanding HF radio propagation
  1427. Understanding HF radio systems
  1428. Understanding ionosphere
  1429. Understanding LF and HF propagation, G0KYA, G3NYK, RSGB (2010)
  1430. Understanding LUF and MUF
  1431. Understanding NVIS
  1432. Understanding of Ham radio propagation
  1433. Understanding of ham radio propagation: Amateur radio guide
  1434. Understanding of HF radio propagation
  1435. Understanding Propagation of Radio Waves
  1436. Understanding Propagation of Skywave
  1437. Understanding propagation numbers
  1438. Understanding propagation: How weather affects radio waves
  1439. Understanding propagation: How weather affects radio waves
  1440. Understanding Propagation: Paul L. Herrman, N0NBH (11-July 2010)
  1441. Understanding Propagation: WB5ANN.pdf
  1442. Understanding radio propagation: A graphical perspective
  1443. Understanding radio propagation
  1444. Understanding Radio Waves
  1445. Understanding radio waves and their frequencies
  1446. Understanding RF propagation: Types and properties
  1447. Understanding Radio Waves: Nature and Properties
  1448. Understanding Radio Waves and their Frequencies
  1449. Understanding Radio Waves: Nature and Properties
  1450. Understanding solar storms and how they impact ham radio
  1451. Understanding the basics of radio propagation
  1452. Understanding skywave propagation
  1453. Understanding solar activity and its impact on HF propagation
  1454. Understanding solar indices
  1455. Understanding space weather indices
  1456. Understanding the basics of HF band conditions
  1457. Understanding wavelengths and frequencies in ham radio
  1458. Usable Frequency Range: from LUF to MUF
  1459. Usable HF frequencies
  1460. Uses of radio waves
  1461. Using HF beacon tracking programs
  1462.  
    V
  1463. Validation of HF propagation models
  1464. Variations in HF radio propagation
  1465. Visualizing HF propagation
  1466. Verification of HF propagation models
  1467. Very High frequency (VHF)
  1468. Very Low frequency (VLF)
  1469. VHF propagation map
  1470. View HF bands conditions at a glance
  1471. Virtual height in wave propagation
  1472. Visualizing HF propagation
  1473. Voacap HF path prediction maps
  1474. VOACAP online
  1475. Voacap online HF predictions
  1476. VOACAP prediction
  1477.  
    W
  1478. Watch Out for Geomagnetic Storms
  1479. Wave attenuation and absorption
  1480. Wave propagation
  1481. Weather influence on HF radio propagation
  1482. WebSDR
  1483. What affects radio signal?
  1484. What affects radio wave propagation?
  1485. What are band conditions banners?
  1486. What are DX clusters?
  1487. What are electromagnetic waves?
  1488. What are geomagnetic disturbances?
  1489. What are geomagnetic indices?
  1490. What are geomagnetic storms?
  1491. What are HF band conditions?
  1492. What are HF band propagation conditions?
  1493. What are ionospheric clouds?
  1494. What are ionospheric conditions
  1495. What are ionospheric effects?
  1496. What are ionospheric models?
  1497. What are propagation indices?
  1498. What are radio blackouts?
  1499. What are radio waves?
  1500. What are radio waves and how do they travel?
  1501. What are solar flares?
  1502. What are solar storms?
  1503. What are space weather scales?
  1504. What are sprites in Earth's atmosphere?
  1505. What are sunspots?
  1506. What are the amateur radio HF band conditions?
  1507. What are the causes of Sporadic E?
  1508. What are the current HF propagation conditions?
  1509. What are the current shortwave propagation conditions?
  1510. What are the disadvantages of HF radio?
  1511. What are the ham radio HF band conditions?
  1512. What are the different types of ionospheric propagation?
  1513. What are the factors affecting RF propagation?
  1514. What are the factors affecting ionospheric conditions?
  1515. What are the geomagnetic indices?
  1516. What are the modes of HF-radio propagation?
  1517. What are the modes of radio propagation?
  1518. What are the R-S-G scales in space weather?
  1519. What are the regions of the ionosphere?
  1520. What are the solar indices?
  1521. What are the sources of medium and large scale traveling ionospheric disturbances?
  1522. What bands and modes will give me voice at 5,000 kilometers?
  1523. What causes ionospheric ionization?
  1524. What causes the ionosphere to form?
  1525. What controls HF propagation under normal conditions?
  1526. What do propagation indices mean?
  1527. What effect does the change of seasons have on HF propagation?
  1528. What does a Grey line mean?
  1529. What does the Solar Flux Index mean?
  1530. What factors influence HF radio propagation?
  1531. What frequency should I use for ham radio?
  1532. What HF bands are allocated for radio amateurs?
  1533. What HF bands are open at night?
  1534. What HF frequency should I use?
  1535. What impact do solar phenomena like sunspots and solar flares have on radio communications?
  1536. What important quality does the ionosphere have?
  1537. What is a geomagnetic storm?
  1538. What is a good app or website to see HF propagation?
  1539. What is an electromagnetic (EM) wave?
  1540. What is Earth's magnetic field?
  1541. What is earth Magnetosphere?
  1542. What is fading?
  1543. What is Geomagnetic Activity?
  1544. What is Geomagnetic Disturbance?
  1545. What is Ham Radio?
  1546. What is ionization?
  1547. What is ionospheric propagation?
  1548. What is greyline propagation?
  1549. What is Hale cycle?
  1550. What is Ham radio propagation?
  1551. What is HF propagation?
  1552. What is HF radio propagation?
  1553. What is HF radio propagation prediction?
  1554. What is HF wave propagation?
  1555. What is high-frequency (HF) radio?
  1556. What is ionization?
  1557. What is K index?
  1558. What is LUF?
  1559. What is MUF?
  1560. What is NVIS?
  1561. What is plasma?
  1562. What is radio?
  1563. What is Radio propagation?
  1564. What Is Radio Wave Propagation?
  1565. What is RF propagation
  1566. What is sky propagation?
  1567. What Is sky wave propagation?
  1568. What Is Skywave propagation?
  1569. What is solar activity?
  1570. What is solar cycle? | Solar cycles: A tutorial
  1571. What is solar wind?
  1572. What is space weather?
  1573. What is the 80 meter band?
  1574. What is the bandwidth of HF radio?
  1575. What is the best HF band for daytime?
  1576. What is the best HF band for DX?
  1577. What is the best time for the 40 meter band?
  1578. What is the best time of day for HF frequencies?
  1579. What is the best time of day for HF radio?
  1580. What is the composition of the ionosphere?
  1581. What is the current HF propagation?
  1582. What is the current LUF?
  1583. What is the current MUF?
  1584. What is the current lowest usable frequency (LUF)?
  1585. What is the current shortwave propagation conditions?
  1586. What is the current skywave propagation conditions?
  1587. What is the dead zone in radio communication?
  1588. What is the difference between solar proton flux and solar proton density?
  1589. What is the difference between Greyline and the Solar Terminator?
  1590. What is the difference between Global versus Regional HF propgation conditions?
  1591. What is the difference between earth Magnetosphere and Earth's magnetic field?
  1592. What is the difference between geomagnetic and ionospheric storms?
  1593. What is the difference between solar indices and propagation indices?
  1594. What is the D region of the ionosphere?
  1595. What is the E region of the ionosphere?
  1596. What is the F region of the ionosphere?
  1597. What is the farthest a ham radio can reach?
  1598. What is the K index for propagation?
  1599. What is the longest range 2 way radio?
  1600. What is the lowest usable frequency?
  1601. What is the LUF frequency?
  1602. What is the max radio range?
  1603. What is the maximum usable frequency?
  1604. What is the range of a 100 watt ham radio?
  1605. What is the skip zone?
  1606. What is the solar cycle?
  1607. What is the solar index?
  1608. What is the structure of the ionosphere?
  1609. What is Total Electron Content? TEC
  1610. What is virtual height?
  1611. Where can I find solar data?
  1612. What radio waves actually are?
  1613. What the numbers mean in propagation
  1614. When will HF band conditions improve?
  1615. Which ham band is open now?
  1616. Which ham bands are open now?
  1617. Which ionospheric region is closest to the Earth?
  1618. Why do we need propagation forecasting?
  1619. Why do we need propagation forecasts?
  1620. Why does space weather affect ham radio?
  1621. Why is HF propagation so poor?
  1622. Why is HF used for long range communication?
  1623. Why is propagation on shortwave (HF) terrible right now?
  1624. Why is shortwave used for long range communication?
  1625. Why is the ionosphere not included in the list of layers?
  1626. Wide-band WebSDR
  1627. Window of usable frequencies: from LUF to MUF
  1628. Working The Gray Line
  1629. Worldwide LUF chart
  1630. Worldwide MUF chart
  1631. WSPR - Weak Signal propagation reporter * WSPR Live * WSPR Rocks
  1632. WSPRnet
  1633.  
    X
  1634. X-ray flares review
  1635. X-Ray flares what are they?
  1636. X-Ray Flux Levels Now
  1637. X-Ray Flux Levels Scale

Total visits since 17 August 2022.
Repeat visits counted as new after 24 hours.

Flag counter site maybe down!

The number of visits (graphs displayed below) peaks during HF propagation disruptions.
all time
Visits (per day) since 2022


Visits (per day) during the last 3 months correlate with
ionospheric events that disrupt HF radio propagation.


Visits (per day) during the last month correlate with
ionospheric events that disrupt HF radio propagation.


Visits (per hour) today