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
A beginner's guide to HF radio propagation
A beginners guide to radio propagation
A combination of long-term prediction and short-term forecast methods
A comparison between Radio and Light propagation phenomena
A comprehensive beginner's guide for RF propagation
A comprehensive guide to HF propagation
A guide for ham radio propagation
A guide to HF propagation
A primer on space weather
A quick guide to solar indices
— A review of skywave propagation indicators
A-index
Absorption
ACE
Active sun
Advanced Techniques in HF Propagation Forecast
ALE
— Automatic link establishment
Alerts
All-in-One HF Propagation Resource
Amateur ham radio
Amateur radio
Amateur radio bands
Amateur radio charactaristics
Amateur radio band conditions
Amateur radio frequencies
Amateur radio frequency allocations
Amateur radio grey line
Amateur radio HF band conditions
Amateur radio HF propagation conditions
Amateur radio HF propagation frequencies & forecast
Amateur radio live maps
Amateur radio maps site
Amateur radio online propagation charts
Amateur radio online propagation conditions
Amateur radio online propagation maps
Amateur radio operator
Amateur radio propagation conditions
Amateur radio propagation forecast
Amateur radio propagation frequencies
Amateur Radio Propagation Map
Amateur Radio Propagation Now
Amateur radio propagation studies
Amateur radio propagation today
Amateur radio solar activity
Amateur radio space weather
Amateur Radio Usable HF Propagation Frequencies & Forecast
Amplitude of radio waves
An introduction to HF propagation
An Introduction to Ionosphere and Magnetosphere(Abstract)
An introduction to radio wave propagation
Antenna directivity
Antenna efficiency
Antenna for NVIS
Antenna gain
Antenna height
Antenna height, directivity, gain
Applications for analyzing and forecasting HF propagation
Applications used for forecasts and predictions
(references — list of sources)
Are there any benefits to solar activity
?
Aurora
|
At what Kp index can I see aurora
?
Aurora forecast
Aurora light show
Auroral Radar Network
(references — list of sources)
Australian Space Weather Alert System (2024)
B
Band conditions
Band conditions banner
Band conditions based on DX charts, PSKR, WSPR, WebSDRs, Beacons
Band conditions charts
Band Conditions Forecast
Band Conditions Ham Radio
Band Conditions—Ham Radio Live
Band Opennings
Banners and widgets
Basic Amateur Radio—HF Propagation
Basic electromagnetic wave properties
Basic EM wave properties
Basic EM wave properties
(references — list of sources)
Basic Wave Propagation, Nor Hadzfizah Binti Mohd Radi (2017)
Basics for Short Wave Operation
Basics of HF propagation
Basics of HF radio propagation
Basics of Radio Waves
Basics of Radio Wave propagation
Be prepared for volatile band conditions
Be ready to try new frequencies
Beacons
Beginner's Guide to Ham Radio Range
Benefits of the HAARP Project for Radio Hams
Best HF frequencies for daytime
Best propagation frequency
Best solar propagation frequency
Beyond line of site
(BLOS)
Blackouts
what are they?
Blind zone
BLOS
(Beyond line of site)
Bt - total strength of the Interplanetary Magnetic field (IMF)
Bz - orientation of the IMF
C
Calculation of the maximum usable frequency
Can a ham radio reach space
?
Can ham radio communicate with the other side of the globe
?
Can ham radio talk around the world
?
Can HF radio propagation be predicted
?
Can I get shorwave radio on my PC
?
Carrington event
CF vs MUF—Difference between CF and MUF
CF vs MUF: Understanding Critical and Maximum Usable Frequencies
Challenges in storm forecasting
Characteristics of radio waves
ChatGPT learns about forecasting tools for radio amateurs
Check DX Propagation with Beacons
Chirping
Choosing the right frequency for the best skywave propagation
Clouds of plasma in the ionosphere
CME
- coronal Mass ejection
Communication blackout
Communication blackout 2024
Communication blackout meaning
Communication blackout today
Compare DR2W propagation tool with VOACAP
Compare forecasting tools for HF radio propagation
Compare forecasting tools for radio amateurs
Comparing Ionospheric MUF using IRI16 Model with Mid Latitude (2020)
Communication conditions
Complex HF propagation Modes
Conductive ground
Correlation analysis of Solar activity and Cosmic ray (J_Phys_Conf 2017)
Correlation of Sunspot Numbers and Geomagnetic Indices with Various Climate Change Parameters (2024)
Correlation between conditions, MUF, SSN and SFI
Correlation between K and A values
Correlation between MUF and solar flux
Correlation Between solar flux and sunspot number
Correlation of sunspot numbers and geomagnetic indices
Correlation between sunspot numbers and geomagnetic parameters for solar cycle 24
Coronal hole
Coronal Mass ejection
(CME)
Critical frequencies
foF2, MUF, OTF, LUF
Critical Frequencies LUF vs MUF
Critical frequency
Critical frequency formula
Critical frequency propagation
Critique of IONCAP's Reliability and Service Probability Calculations (1993)
Current band conditions
Current flare
Current ham bands conditions
Current ham radio conditions
Current ham radio HF propagation
Current ham radio propagation
Current ham radio propagation chart
Current ham radio propagation conditions
Current HF band conditions
Current HF Band Conditions Maps For Radio Operators
Current HF Band conditions online map
Current HF Bands Conditions—Charts for Radio Hams
Current HF conditions
Current HF propagation
Current HF propagation
Current HF Propagation Conditions
Current HF Propagation Conditions FAQ
Current HF propagation conditions maps for radio operators
Current HF propagation map
Current HF radio propagation
Current Kp index
Current MUF
Current optimal frequency charts
Current propagation chart
Current propagation conditions
Current radio communication conditions
Current radio propagation conditions
Current shortwave propagation conditions
Current Shortwave propagation conditions map
Current skywave propagation
Current solar activity
Current solar alerts
Current solar conditions Ham radio
Current solar cycle prediction
Current solar events
Current Solar Flare
Current space weather parameters
Current sunspot cycle
Current sunspot cycle activity
Critical frequency
Critical frequency map/chart
D
D layer of ionosphere
is rather a region
D region
D-Rap
D-Region Absorption Prediction
Daily sunspots groups
Day night live world map
Day-night—diurnal cycle
Dead Zone
Definition of the Ionospheric Regions
Decoding space weather data for HF propagation
Detection and Localization of F-layer Ionospheric Irregularities (2022)
Digisonde Directogram
Digital Reporter
Direct wave propagation
Dispertion of light
Dispersion of radio waves
Disturbance-storm time (Dst) index
Diurnal cycle
DR2W - DX propagation
Dst
DX band conditions
DX charts
DX conditions
DX clusters
or
DX Spots
DX cluster is your friend
DX ham band conditions
DX map
|
DX propagation map
DX propagation online map
DX propagation prediction
DX radio live
DXMAPS
DXView HF
DXView map
DXWatch
DXZone
E
E layer of ionosphere
is rather a region
E-region
E-sporadic forecast - propquest
Earth's Atmosphere Layers
Earth's Ionosphere Regions
Earth's magnetic field
Earth's Magnetosphere
Earth Magnetosphere vs Earth's magnetic field
Earth observing system (EOS)
Earth's magnetic field
Easy learning radio propagation
Effects of geomagnetic storms on ham radio
Effects of geomagnetic storms on radio hams
Effects of ionospheric motions and irregularities on HF radio propagation
Effects of radio waves
Effects of solar activity on amateur radio
Electromagnetic Spectrum
Electromagnetic Radiation
Electromagnetic Wave
Electromagnetic Waves Basics
Electron densities
Electron flux
(
Ef
)
Elevation Angle
EM wave Properties
EME Deg - earth-Moon-Earth Degradation
Equatorial Spread-F Ionospheric dynamics (1962)
EsEU - Sporadic E Europe
EsNA - Sporadic E North America
Estimated sunspot number
Etymology of ham radio
EUV sunlight
Evolution of Forecasting Techniques
Explain HF propagation charts
Explain HF propagation indicators
Explain HF propagation indices
Explain propagation banners
Explain skywave erratic propagation conditions
Explain skywave propagation
Explain space weather for radio amateurs
Explain space weather indices
Explain solar indices
F
F layer of ionosphere
is rather a region
Fadeouts
Fading
Fading due to irregularities of ionospheric regions
FAQ about HF propagation
F10.7
F-region
Find charts showing the live conditions
Find your opening on the map
Finding the best operating frequencies for skywave propagation
Flares
f
o
F
2
(critical frequency)
foF2 map
Forecast ham bands conditions
Forecast HF bands conditions
Forecast HF propagation conditions
Forecast HF radio propagation - applications
Forecast HF propagation conditions
Forecast of HF propagation for radio amateurs
Forecast of The Ham radio propagation
Forecast propagation
Forecast propagation for radio amateurs
Forecast Proton flux
Forecast short wave propagation conditions
Forecast skywave propagation
Forecast solar flare
Forecast vs Prediction
Forecast vs prediction of HF band conditions
Forecasting and Prediction
Forecasting evolution over the last 30 years
Forecasting HF propagation for radio amateurs
Forecasting ionospheric disturbances
Forecasting MUF for a 3000 km path
Forecasting tools for radio amateurs
Forecasting vs. Prediction
Free Electron Density
Free gray line map
Free Resource for Amateur Radio Beginners
Frequency Allocations
Frequency of optimum transmission (FOT)
Frequency of optimum traffic (FOT)
Fundamentals of radio propagation
Fundamentals of radio waves propagation
G
G
0
-G
5
: scale of geomagnetic activity
Gamma rays
Gama rays bursts
(GRB) a cosmic event
"GeoMag" (index) - earth`s geomagnetic field activity
Geomagnetic
Geomagnetic activity
Geomagnetic activity forecast
Geomagnetic conditions
Geomagnetic data
Geomagnetic disturbance
|
Geomagnetic disturbances
Geomagnetic field activity
Geomagnetic forecast
Geomagnetic indices K, A, HPo
|
Geomagnetic Indices
Geomagnetic Indices Explained
Quick guide
Geomagnetic storms
Geomagnetic storm and equatorial spread-F (2004)
Geomagnetic Storm Dynamics
Geomagnetic storm ham radio
Geomagnetic Storm Impacts
Geomagnetic storms ham radio
Geomagnetic storm radio amateur
Geomagnetic storms
Geophysical activity
Getting Started in HF
Global conditions
|
Global conditions banners
Global HF conditions
Global HF fadeout
Global HF propagation
Global radio propagation conditions
Global vs Regional HF propagation conditions
Gray line greyline
Gray line live map
Gray line propagation
GRB
- Gama-rays bursts
Grey Line Map
Grey line map real time
Greyline
Greyline propagation
Greyline radio propagation explained
Greyline vs "Solar Terminator"
Ground wave and sky propagation
Ground wave propagation
Ground wave vs skywave
Ground waves
Guide for radio hams about HF propagation
Guide to radio wave propagation, studies, guides and documentation
H
Hale cycle
Ham band conditions
Ham band condition now
Ham bands conditions
Ham band map
Ham band propagation map
Ham band status
Ham bands' activity
Ham propagation map
Ham radio atmospheric conditions
Ham radio bands and frequencies
Ham radio band conditions
Ham radio band conditions app
Ham radio band conditions map
Ham radio band conditions today
Ham Radio Band Frequencies
Ham Radio Bands: Frequencies and Characteristics
Ham radio basics: Beginners guide to HF radio propagation
Ham radio charts
Ham radio condition charts
Ham radio conditions
Ham radio condition maps
Ham radio current conditions
Ham Radio Dead Bands
Ham radio DX live streaming
Ham radio DX map
Ham radio for Beginners
Ham radio for Newbees
Ham radio for Newbeis
Ham radio frequency chart
Ham radio frequencies
Ham Radio Guide for HF propagation
Ham radio HF band conditions
Ham radio HF conditions
Ham radio HF propagation real-time
Ham radio propagation
Ham radio propagation app
Ham radio propagation conditions
Ham radio propagation forecast
Ham radio propagation forecasts
Ham radio propagation frequencies
Ham radio propagation live map
Ham radio propagation overview
Ham radio propagation map
Ham radio propagation now
Ham radio propagation prediction
Ham radio propagation real-time
Ham radio propagation review
Ham radio propagation: Solar conditions
Ham radio propagation today
Ham radio propagation tutorial
Ham radio propagation websites
Ham Radio Range Guide
Ham Radio Range Guide: How Far Can You Talk
?
Ham Radio Range: How Far Can You Talk With It
?
Ham radio solar activity
Ham radio solar conditions
Ham radio solar cycle
Ham radio solar weather
Ham radio space weather
Ham radio websites
Ham radio websites about forcasing HF propagation
Ham radio sun conditions
Ham radio sunspot
Ham radio sunspot conditions
Ham radio sunspots now
Ham radio wave propagation
Ham Solar
Ham solar conditions
HamSCI Space Weather Operational Resources and Needs of the Amateur Radio Community (2020)
Heliophysics
Heliophysics and Amateur Radio
Heliosphere
Heliospheric Current Sheet (HCS)
Helioviewer
Helium lines
HF—High frequency
HF bands affected by solar conditions
HF bands allocated for radio amateurs
HF bands allocated for radio amateurs and their characteristics
HF bands allocated for radio amateurs and their features
HF bands assigned to hams
HF bands assigned to radio amateurs
HF band conditions
HF band conditions maps
HF band conditions Regional
HF Band conditions: A Comprehensive Guide
HF Bands Ham Radio Guide
HF bands open now
HF band propagation chart
HF bands monitoring
HF communication
HF communication prediction tools
HF conditions
Regional
HF conditions at a glance
HF critical frequency
HF DXView
HF frequency range
HF open now
HF prediction
|
HF propagation
HF propagation — The basics
HF Propagation and the Ionosphere
HF propagation and solar-terrestrial data
HF propagation app
HF propagation applications
HF propagation basics
HF propagation blackout
HF propagation calculator
HF propagation chart
HF propagation conditions
HF Propagation Conditions: Forecasting and Prediction
HF propagation conditions at a glance
HF propagation data app
HF propagation data seasons
HF propagation data study
HF propagation disruptions AU
HF propagation disruptions UK
HF propagation disruptions US
HF propagation experts
HF propagation explained
HF propagation explanation
HF propagation fadeouts
HF propagation fluctuations
HF propagation for advanced hams
HF Propagation for Amateurs
HF propagation for beginners
HF propagation for beginners and advanced
HF Propagation for Ham Radio Explained
HF propagation for newbees
HF Propagation for Amateurs
HF Propagational Resources
HF propagation for radio amateurs
HF propagation for radio hams
HF propagation forecast
HF propagation forecast
HF propagation forecast applications
HF propagation forecast for radio amateurs
HF propagation forecast tools
HF Propagation Forecasting
HF propagation fundamentals
HF propagation guide
HF propagation guide for radio hams
HF propagation indicators
HF propagation ionospheric disturbances
HF propagation live chart
HF propagation live map
HF propagation map
HF propagation map google
HF propagation models
HF propagation modes
HF propagation modes overview
HF propagation now (real-time)
HF propagation online map
HF propagation online reports
HF propagation overview
HF propagation prediction
HF propagation prediction based on real-time DX reports
HF propagation prediction online
HF propagation prediction software
HF propagation predictions
HF propagation preface
HF propagation reporter
HF propagation reports
HF propagation shortcast overview
HF propagation shortcast review
HF propagation score
HF propagation shortcasts
a folder of brief podcasts less than 15 minutes
HF Propagation software review
HF Propagation solar indicators
HF propagation status
HF propagation tools
HF propagation tutorials
HF propagation tutorial for radio amateurs
HF propagation tutorials
HF propagation today
HF propagation tools
HF propagation widget
HF radio propagation
|
HF radio propagation seasons
HF radio propagation app
HF radio propagation bands
HF radio propagation basics
HF radio propagation chart
↗
↗
HF radio communication
HF radio propagation during a solar storm
HF radio propagation conditions
HF radio propagation for beginners
HF radio propagation forecast
HF radio propagation indices and scales
HF propagation map
Nowcast
HF radio propagation map
Explanations
HF radio propagation modes
HF radio propagation now
HF radio propagation today
HF radio propagation prediction
|
HF radio propagation prediction compared to forecast
HF radio propagation tutorial for radio amateurs
HF propagation widget
HF radio conditions
HF radio propagation
HF radio propagation forecast
HF radio propagation maps
HF radio propagation software
HF radio propagation today
HF radio wave propagation
HF radio waves
(basics)
HF radio wave propagation factors
HF real-time propagation
HF signals propagation
HF skywave communication
HF skywave window: LUF—MUF
HF space weather
HF wave propagation
HFTA - High frequency Terrain Assessment
High frequency communications response to solar activity
High frequency propagation software
High frequency radio propagation
Highest frequency bands at night
Highest Possible Frequency (HPF)
History of amateur radio
How are HF conditions determined
?
How are ionospheric conditions measured
?
How can I monitor HF bands without having a good receiver and antenna
?
How can I operate during solar storms
?
How can I use my PC as a ham band monitor
?
How can propagation reports help ham radio operators
How can we forecast changes in HF conditions over the next hour
?
How can we forecast HF propagation conditions
?
How do disturbances such as solar flares, geomagnetic storms, and traveling ionospheric disturbances affect radio wave propagation
?
How do geomagnetic storms affect radio wave propagation
?
How do I find out what bands are open
?
How do ionospheric disturbances affect radio wave propagation
?
How do radio waves bounce off the ionosphere for long-distance communication
?
How do radio waves propagate
?
How do radio waves travel through the Earth's atmosphere
?
How do solar flares affect radio wave propagation
?
How do solar flares cause geomagnetic storms
?
How do solar storms affect radio propagation
?
How do solar storms cause geomagnetic storms
?
How do the seasons affect HF radio propagation
?
How do traveling ionospheric disturbances affect radio wave propagation
?
How do you read HF band conditions
?
How do we monitor space weather
?
How does Geomagnetic activity affect HF propagation
?
How does elevation affect HF propagation
?
How does HF propagation work
?
How Does Ionospheric propagation take place
?
How Does Ionospheric propagation work
?
How does HF radio propagate
?
How Does Radio Waves Compare to Visible Light
?
How does the ionosphere affect HF radio propagation
?
How does the ionosphere affect radio wave propagation
?
How does the ionosphere couple with the neutral atmosphere and with space
?
How does the ionosphere respond to inputs from space and from the neutral atmosphere
?
How does the sun affect radio communication
?
How far can 40m band go? How far can you talk on a 10-meter band?
How far can a ham radio reach
?
How far can ham radio talk
?
How far can HF radio go
?
How far can HF radio transmit
?
How far can I communicate
?
How far can I talk
?
How far can I talk with my ham radio
?
How far can you talk on ham radio
?
How far will a radio transmit
?
How solar storms affect ham radio propagation
How to assess propagation
?
How to choose antenna
?
How to choose ham band based on propagation conditions
?
How to determine HF propagation conditions
?
How to determine if a band is open
?
How to improve HF communication frequency selection ability
?
How to know if a band is open
?
How to predict MUF
?
How to read HF band conditions
?
How to use a remote HF radio receiver
?
How will a solar storm affect my ham radio activities
?
HPF—Highest Possible Frequency
Hybrid ionospheric models
I
IMF - Interplanetary Magnetic field
Incident angle
Impacts of space weather
Impacts of space weather on HF radio communications
Impact of the sun
Index of refraction—
Glass's refractive index in comparison to plasma/ionosphere
Interplanetary magnetic field (IMF)
Interpretation of the propagation indices
Introduction to HF propagation
Introduction to HF Radio Propagation Australian Gov (2002)
Introduction to-HF Radio Propagation Australian Gov (2007)
Ionospheric Propagation, Prof. Sean Victor Hum (2018)
Ionospheric propagation frequency range
Ionospheric Radio Propagation, Kenneth Davies (1965)
Introduction to ionospheric propagation
Introduction to RF propagation
Ionisation
Ionization
IonoProbe
Ionogram
Ionograms
(references — list of sources)
Ionosonde
Ionosondes
(references — list of sources)
Ionosondes HF propagation
ionosphere
Ionosphere — HF radio propagation
; Multi-refractions; free electron density and Geomagnetic storms
Ionosphere and HF
Ionosphere and radio signals
Ionosphere and skywave propagation
; Ionization of D, E and F regions | Free-electron density | Skywaves
Ionosphere at night
Ionosphere dynamics
Ionosphere is a part of which layer of atmosphere
?
Ionosphere is also known as
...
Ionosphere layers diagram
Ionosphere probing
Ionosphere propagation
Ionosphere regions
Ionosphere temperature
Ionosphere understanding
Ionosphere, radio waves
Ionosphere, space weather and radio propagation
Ionosphere’s influence
Ionospheric absorption
Ionospheric anomalies
(references — list of sources)
Ionospheric bubbles
Ionospheric clouds
Ionospheric conditions
|
Ionospheric conditions
Ionospheric data
Ionospheric dispertion of radio waves
Ionospheric distortion
Ionospheric disturbances
Ionospheric disturbances and HF propagation conditiona
Ionospheric disturbances and their impacts on HF radio wave propagation
Ionospheric disturbances probing
(references — list of sources)
Ionospheric dynamics
Ionospheric effects on hf radio wave propagation
Ionospheric interference
Ionospheric irregularities
Ionospheric models
(references — list of sources)
Hybrid ionospheric models
Ionospheric models
Ionospheric models that simulate a neural network
Ray-tracing models
Skywave propagation indices
Skywave propagation Mathematical Models
Ionospheric monitoring and HF frequency management
Ionospheric prediction and HF frequency management
Ionospheric propagation
Ionospheric propagation chart
Ionospheric propagation map
Ionospheric propagation examples
Ionospheric propagation model
Ionospheric propagation of radio waves
Ionospheric propagation of radio waves explained
Ionospheric propagation theory
Ionospheric radio propagation
Ionospheric reflection
(resources)
Ionospheric refraction
(resources)
Ionospheric radio propagation
Ionospheric regions
Ionospheric regions
(references — list of sources)
Ionospheric regions and HF Skywaves
Ionospheric research
(references — list of sources)
Ionospheric skywave propagation
Ionospheric storms
Ionospheric variations
(references — list of sources)
Is HF propagation reciprocal
?
IRI ionospheric model
ITU model
J
John Ashworth Aatcliffe (12-December-1902-25-October 1987)
K
KC2G HF MUF propagation maps
Keep an Eye on the High Bands
Key aspects of radio propagation for hams
Key concepts of HF propagation
Key factors affecting HF propagation
Key for HF Propagation Charts
K-Index
K-index Australia
K-index United Kingdom
K-index United States
Kp index
Kp index Aurora
Kp Index Explained
Kp index Nowcast
KiwiSDR
map of remote public SDR receivers accessible via the Internet
L
Lagrange points
Latest HF Bands Propagation
Layers or regions of the ionosphere
?
Learning about space weather
Line-Of-Sight propagation
(LOS)
Live ham radio map
Live HF propagation
Live HF Propagation Charts and Maps
Live HF propagation map
Live radio propagation map
Live solar activity
Live solar alerts
Live solar events and past solar activity
Listen live ham radio
LOS
LOS - Line of sight propagation
Long and mid-range skywaves
Long distance communication
Lowest & Maximum Usable Frequency, Critical Frequency
Lowest usable frequecy (LUF)
Lowest Usable Frequency map
LUF frequency range due to SID
LUF frequency range chart
LUF (Lowest Usable frequency)
LUF chart
LUF chart for radio amateurs
LUF map
LUF Propagation Map
M
Magic band openings
Magnetic field
Magnetosphere
(MS)
Making sense of solar indices
Mastering HF propagation
Maximum usable frequency
(MUF)
Maximum Usable frequency map
Methods for forecasting band conditions
Methods for monitoring HF propagation
Methodes to forecast radio propagation
Minimum usable frequecy
—The lowest usable frequency (LUF)
Model evaluation
Model validation
Model verification
Modeling the Topside Ionosphere Observations by Satellites (2003)
Models
Modes of HF radio propagation
Modes of radio propagation
Modes of Radio Wave Propagation in Wireless Communication
Monitor band activity of radio amateurs
↗
Monitoring HF band activity
Moniotring HF propagation
Monitoring solar flux levels for promising band openings
MS — Meteor Scatter Activity
MUF
|
Maximum Usable Frequency
MUF(3000)F2 plots
MUF 3000 km map
MUF and LUF
MUF calculation
MUF calculator
MUF factor
MUF ham radio
MUF indicators
MUF LUF FOT
MUF LUF prediction
MUF map
MUF map real time
MUF maps and charts
MUF meaning
MUF propagation
MUF propagation chart
MUF propagation map
MUF propagation online map
MUF radio propagation
MUF radio propagation map
MUF, LUF, and FOT
N
Near real-time HF propagation charts
Near real-time F2-region critical frequency map
Near real-time regional maps
Near real-time skywave propagation charts
Near Vertical Incidence Skywave
NET ionospheric model
NM7M’s-HF-Propagation-tutorial-2015-by-Thierry-Lombry,-LX4SKY
(txt file)
NM7M HF Propagation tutorial
NOAA
NOAA predicted sunspot number
NOAA Radio dashboard
NOAA solar cycle
NOAA solar flux predictions
NOAA sunspot cycle predictions
NOAA SWPC space weather scales
Noise level
Nowcast HF propagation conditions
Number of radio amateurs by country
NVIS
NVIS antenna
NVIS map
NVIS propagation
NVIS propagation concept
NVIS propagation maps
NVIS tutorial
NVIS: Stephen C. Finch AI0W (2008)
O
Observations - Geo (Terrestrial) & Solar
Observations and Modeling of Traveling Ionospheric Disturbances
On-line HF Propagation Prediction
Online chart of the recent LUF
Online HF propagation prediction
Online indices
Online LUF chart
Online LUF map
Online propagation charts
Online HF propagation prediction
Online propagation tools
Online real-time propagation charts
Optical dispertion of light vs Ionospheric dispertion of radio waves
Optimal sending frequency
Optimum traffic frequency (OTF)
Optimum transmission frequency (OTF)
Optimizing HF bands
: Frequency, Propagation, and Time-of-Day
OWF — Optimum Working frequency
P
Past solar activity
PCA (polar cap absorption)
Physics of Propagation - Refraction Absorption Polarization
Plasma
Plasma clouds
Polar cap absorption (PCA)
PSKR, WSPR
Practical applications
Practical approach
Practical guide
Predict conditions
Predict HF propagation radio propagation
Predict MUF
Predict propagation
Predict skywave propagation
—nowcast
Predict solar flux
Predict space weather
Predict sunspot numbers
Prediction of sky-wave propagation conditions
Predicting HF Band Conditions for Ham Radio
Predicting HF propagation
Predicting ionospheric conditions
Predicting propagation
Predicting propagation of skywave
Predicting radio propagation
Predicting skywave propagation
Predicting solar flares
Predicting solar flux
Prediction
Prediction vs forecast of HF band conditions
Principles of radio wave propagation
Probing ionospheric disturbances
(references — list of sources)
Propagation
Propogation and RadioScience, KL7AL (ARRL 2005)
Propagation and Sun
Propagation beginner's guide
Propagation characteristics of radio waves
Propagation characteristics analysis of high-frequency radio waves
Propagation HF prediction
Propagation indicators
Propagation indicators: foF2, MUF, OWF, LUF
Propagation indices
Propagation
—
modes of HF radio propagation
Propagation charts for ham radio
↗
↗
Propagation condition map
Propagation conditions
Propagation DX
Propagation explained
Propagation factors & conditions
Propagation forecast
Propagation forecast for HF radio
Propagation forecast methodes
Propagation forecasts for radio amateurs
Propagation guide for radio hams
Propagation indices
(plural of propagation index)
Propagation live map
Propagation map
Propagation map for ham radio
Propagation maps for ham radio
Propagation modes
Propagation Modes, Ken Larson, KJ6RZ (2024)
Propagation of HF radio waves
Propagation of radiowaves
Propagation of radio waves
Propagation of radio waves explained
Propagation of RF Signals
Propagation of high frequency radio waves — The rebirth of HF
Propagation of radio waves for beginners
Propagation of shortwave radio
Propagation of short radio waves
Propagation online map
Propagation Overview 48-Hour
Propagation prediction
Propagation prediction programs and forecasts
Propagation Prediction Tool
Propagation prediction tools
Propagation reports
Propagation report ham radio
Propagation reports for Ham radio
Propagation software
Propagation tools for ham radio
Propagation tools to help succeed with your ham radio
Propagation Tutorial
|
Table of contents
Propagation visualization
Properties of electromagnetic waves
Properties of radio waves
Proton flux
(Pf)
PSKR - PSK reporter
Q
QSL net propagation
QSO Activity reports
Quick guide to HF propagation using solar indices
Quiet sun
R
R-S-G Scales defined
R-S-G Scales now
R1-R5
: Scale of
Radio blackouts
Radio Amateur
Radio blackout
Radio blackout effects
Radio blackout map
Radio blackout phenomenon
Radio blackout today
Radio blackouts
Radio amateurs HF bands charactaristics
Radio blackouts due to solar storms
Radio blackout events during 2024
Radio communication and the ionosphere
Radio communications dashboard
Radio fadeouts
Radio frequency
Radio frequency chart
Radio frequency range chart
Radio frequency ranges chart
Radio frequency table
Radio frequency use chart
Radio frequency and Ionosphere
Radio frequency propagation
Radio frequency propagation
Radio frequency propagation: A comprehensive beginner’s guide
Radio frequency propagation for Ham radio
Radio frequency propagation: A Comprehensive Guide
Radio ham bands live
Radio ham HF band conditions
Radio propagation
Radio propagation
- what is it?
Radio propagation and space weather
Radio propagation basics
Radio propagation beacon
Radio propagation charts
Radio propagation conditions map
Radio propagation data map
Radio propagation explained
Radio propagation forecast
Radio propagation forecasting
Radio propagation formula
Radio propagation free software
Radio propagation frequency
Radio propagation levels map
Radio propagation live map
Radio propagation maps
Radio propagation model
Radio propagation modeling
Radio Propagation Prediction
Radio propagation prediction for HF communications
Radio propagation prediction vs. foracasting
Radio propagation prediction modelling
Radio Propagation Online Tools
Radio Propagation Overview
Radio Propagation Overview Recent 48-Hours
Radio propagation properties
Radio propagation software
Radio propagation today
Radio propagation tool
Radio propagation tutorials for radio amateurs
Radio spectrum
Radio wave
Radio Wave fundamentals
Radio wave principles
Radio wave propagation
Radio wave propagation
Radio wave propagation fundamentals
Radio wave propagation guide
Radio wave propagation in the ionosphere
Radio wave propagation model
Radio Wave Propagation part-1 Introduction, Marcel H. De-Canck, ON5AU (2002)
Radio wave propagation tutorial
Radio wave HF propagation models
Radio wave characteristics
Radio wave propagation charactaristic
Radio wave propagation forecasting
Radio wave propagation in the ionosphere
Radio wave propagation today
Radio wave transmission
Radio waves
Radio waves and the ionosphere
(effetcs) |
Radio waves and the Ionosphere
(structure, regions)
Radio Waves and the Ionosphere, G3YWX (QST 1999)
Radio waves examples
Radio waves nature and properties
Radio waves overview
Radio waves properties
Radio wave spectrum
Radio-wave propagation modes
Radiowave Propagation
Ray tracing models
Ray tracing
Optics
RBN - Reverse beacon Network
Real time activity of radio amateurs
Real time band conditions
Real time band conditions for ham radio
Real time data
Real time DX data
Real time DX propagation conditions
Real time DX reports * HF propagation prediction
Real time forecast of HF radio propagation
Real time ham band activity using the internet
Real time HF band conditions
Real time HF DX Propagation Prediction
Real time HF propagation charts
Real time HF propagation maps
Real time HF propagation prediction
Real time HF propagation reports
Real-time ionogram
Real time MUF 3000 km propagation map
Real time MUF map
Real time propagation and band conditions
Real time propagation charts
Real time propagation charts for HF radio
↗
↗
Real time propagation conditions
Real time propagation map
Real time radio propagation map
Real time radio propagation reports
Real time reports HF propagation
Real time reports of space weather
Realtime skywave propagation reports
Real time solar flare
Real time space weather reports
Real time space weather reports
—Explanation
Real time sunspots number
Real time watching of worldwide ham activity
Real time watching of worldwide hams' activity
Recent geomagnetic storms
Recent geophysical & solar observations
Recent Kp
Recent MUF distribution
Recent observations - Geo (Terrestrial) & Solar
Recent propagation conditions
Recent R-S-G reports
Recent solar flares
Recent sunspots number
Reciprocal HF propagation
Refraction of radio wave compared to visible light
Refractive index maps
Refractive index of HF radio in the ionosphere
Regional and global online reports of HF propagation
Regional conditions
Regional HF conditions
Regional MUF and solar indices
Regional propagation
Regional Variations
Regional vs Global HF propgation conditions
Regional vs Global propgation conditions
Regions of ionization
Region vs. Layer: Earth's Atmosphere and Ionosphere
Remote sensing of the ionosphere
Remote receivers, WebSDR and KiwiSDR
Report skywave erratic propagation conditions
Reports of space weather
Reports of Space Weather Conditions
Resources for Predicting HF Band Conditions for Ham Radio
RSG scales
of
Space Weather
S
Satellites for space weather observations
S1-S5
- scale of
Solar radiation storms
SDO - Solar Dynamic Obervatory (NASA)
SDR - Software Defined radio
SDR spectrum
Seasonal Effects on propagation
Seasonal phenomena
Seasonal variations in HF radio propagation
Seasons affect HF radio propagation
Selecting techniques for HF radio communication
SEP
Severe geomagnetic storm
SFI
SFI today
SFU
Short Wave propagation
Shortwave Band Characteristics
Shortwave listening (SWL)
Shortwave radio frequencies — chart
Shortwave propagation
Shortwave propagation conditions
Shortwave propagation conditions
map
Shortwave propagation forecast
Shortwave propagation map
Shortwave propagation prediction
Shortwave radio propagation
Shortwave radio propagation today
SID
- Sudden ionospheric disturbances
Significance of solar activity for amateur radio
Significant frequencies relevant to skywaves
Significat radio blackout events during 2024
Simple Ham radio
Skip distance
|
Skip distance
—Skywave
Skip zone
Skip zone and skip distance
Sky propagation advantages
Sky propagation critical frequencies
Sky propagation diagram
Sky wave propagation
Sky wave propagation diagram
Sky wave propagation example
Sky wave propagation frequency range
Sky wave propagation pdf
Skywave
Skywave concept
Skywave frequencies to listen to
Skywave HF radio propagation
Skywave multi-refractions
Skywave propagation dynamics
Skywave propagation—AI generated shortcast
courtesy of Jean-Paul Suijs, PA9X
Skywave propagation basics
Skywave propagation conditions
Skywave propagation example
Skywave propagation for radio amateurs
Skywave propagation forecast
Skywave propagation frequency range
Skywave propagation indices
Skywave propagation mathematical models
Skywave propagation review pdf
Skywave propagation pdf
Skywave propagation references
Skywave propagation review
Skywave propagation secrets
Skywave propagation tutorial
Skywave propagation
—What is it?
Software for HF propagation prediction
Solar activity
Solar Activity
associated with HF radio propagation on earth
Solar Activity & Ham radio propagation
Solar Activity & HF propagation
Solar activity affects HF propagation
Solar activity affects skywaves
Solar activity and HF propagation
Solar activity and the ionosphere
Solar activity chart over time
Solar activity cycle chart
Solar activity for radio amateurs
Solar activity forecast
Solar activity prediction
Solar activity radio propagation
Solar conditions & ham propagation
Solar conditions affect HF radio propagation
Solar conditions and ham propagation
Solar conditions and ham radio propagation
Solar conditions and HF radio propagation
Solar conditions for radio propagation
Solar cycle
Solar Cycle Ham radio
Solar cycle radio amateur propagation
Solar Cycle, status and progression
Solar data
Solar dynamics
Solar Electromagnetic Spectrum
Solar energetic Particle (SEP)
Solar events
Solar events live
Solar flare alert
Solar flare chart
Solar flare forecast
Solar flare history chart
Solar flare interference comparison
Solar flare radiation
Solar flare radiation graph
Solar flare warning
Solar flares
Solar flares and HF fadeouts
Solar flares and HF Propagation
Solar flares and propagation
Solar flares and Radio blackouts
Solar flares hitting earth today
Solar flares today alerts warnings
Solar flares classification chart
Solar flux
Solar flux chart for today
Solar Flux Index (SFI)
Solar flux index chart
Solar flux indices: SF, SSN
Solar flux index today
Solar flux outlook
Solar Flux Today
Solar flux value for today
Solar Flux versus Sunspot Activity
Solar Flux, Sunspots, and Ionizing Radiation
Solar Ham
Solar Indices
: SSN, Solar Flux
Solar indices and space weather
|
Solar Indices Explained
Solar indices today
Solar indices what are they
?
Solar index propagation chart
Solar index today
Solar maximum
Solar minimum
Solar observations
Solar Particle event (SPE)
Solar phenomena
Solar propagation ham radio
Solar radiation
Solar radio flux
Solar Radio Interference
Solar Region Data - SunSpots
Solar spectra
Solar storm ham radio
Solar storm radio amateur
Solar storm today
Solar storm warning today
Solar storms
(X-ray flares and particle events)
Solar storms
overview
Solar storms
consist of solar flares and Coronal Mass Ejections (CME)
Solar storm FAQs: Your top amateur radio questions answered
?
Solar storms ham radio
Solar synoptic map
Solar terminator
(i.e. Greyline)
Solar terrestrial activity report
Solar Terrestrial Data
Solar terrestrial data explained
Solar UV and X-ray spectral diagnostics (2018)
Solar weather info
Solar weather reports
Solar wind
Solar wind Ham radio
Solar wind real-time dials
Solar wind reports
Solar X-Ray
(Phenomenon)
Solar X-ray Imaging system (SXI)
Solar X-Ray flux levels
SolarWx
Space wave
Space weather
a comprehensive tutorial
Space weather agencies & services
Worldwide
Space weather and amateur radio
Space weather and propagation
Space weather and radio communications
Space weather and radio propagation
Space weather by solar ham
Space weather data and plots
Space weather effects on communication systems
Space weather effects on communications systems (June 2020)
Space weather events
Space weather for Amateur Radio
Space weather forecast
Space weather for radio hams
Space weather forecasting
Space weather ground-based observatories
Space weather ham radio
Space Weather HF propagation
Space Weather HF Radio propagation
Space weather live
Space weather models
Space weather needs of the amateur radio community
Space weather news
Space Weather Nowcast
Space weather observations
Space weather observations from satellites
Space weather overview
Space weather phenomena
Space weather prediction
Space Weather Prediction Center
(NOAA)
Space weather predictions for radio amateurs
Space weather reports
Space weather reports
Space weather scales
Space weather: real-time 24hr effective sunspot number
SPE
Sporadic E (E
s
)
Sporadic E multipath
Sporadic E propagation
Spread F
Sprites
SSN
Stanley article of the month (QST-June-2021)
Stratosphere
Sudden Ionospheric Disturbances
(SID)
Summary
Sun flare propagation
Sun flare radiation
Sun spots ham radio today
Sunspot index correlation
Sunspot number
Sunspot numbers explained
Sunspots
Sunspots and HF propagation
Sunspots and skywave propagation
Sunspots and solar flares
Sunspots and sun flare
Sunspots and solar flux
Sunspots and the ionosphere
Sunspots ham radio today
Sunspots NOAA predicted sunspot number
Sunspots number
Sunspots number today
Sunspots explained
Sunspots
Sunspots and solar flux
Sunspot cycle
Sunspot number
SuperDARN
Sunlight
Sunspot cycles
Sunspot index since 1750
Sunspot index and long-term solar observations
Sunspot number and radio flux
Sunspot number forecast
Sunspot number prediction
Sunspot propagation chart
Sunspot propagation effects
Sunspots recent days
Sunspot solar cycle 25
Sunspots today
Surface wave propagation
SWPC
=
Space Weather prediction center
(NOAA)
T
T Index map
Table of frequency allocations chart
TEC - Total electron content
Terminator line
Terrestrial geomagnetic indices
Terrestrial observations
The Big Gun`s Guide to Low Band Propagation: A book by NM7M (2002)
The current propagation conditions
The decline and comeback of skywave HF radio
The effects of weather on amateur radio propagation
The effective ham radio range
The electromagnetic spectrum
The HF bands assigned to hams
The HF bands assigned to radio amateurs
The HF bands for newcomers
The impact of geomagnetic storms on HF propagation
The importance of frequency management in HF radio communications
The influence of ionospheric electron density fluctuations on HF propagation
The ionosphere
The ionosphere and HF propagation
The Little Pistol's Guide to HF Propagation Robert R. Brown, Worldradio Books (1996)
The lowest usable frequecy
The Magic of Aurora
The magnetosphere
The maximum range of ham radios
The propagation of radio waves
The radio spectrum
The Rebirth of Shortwave radio communication
The rebirth of skywave HF radio
The recent propagation conditions
The recent sunspots number
The relationships between sunspot number and solar radio flux at 10.7 centimeters
The science behind radio wave propagation
The solar cycle
|
SSN Explained
The solar cycle and sunspots
The Sun and space weather
The Super Dual Auroral Radar Network
(SuperDARN)
The Structure of the Ionosphere
Theory-Based Tutorial on HF Propagation
Thermosphere
TID
(Traveling ionospheric disturbances)
Total Electron Content (TEC)
Tools & Applications
Tools for analyzing and forecasting HF propagation
Total electron content
— TEC
Tracking digital modes
Tracking global beacons
Transmission Angle
Traveling ionospheric disturbances
(TID)
Transient Luminous Events (TLEs)
Troposphere
Twilight zone
Types of radio wave propagation
U
Ultraviolet
Understanding Amateur Radio Bands
Understanding Amateur Radio NVIS
Understanding Geomagnetic Indices
Understanding Ham bands conditions banner
Understanding Ham radio propagation
Understanding HF propagation
Understanding HF Propagation Review
Understanding HF propagation banners
Understanding HF propagation
Understanding HF Propagation for radio hams
Understanding HF propagation numbers
Understanding HF propagation practice
Understanding HF radio propagation
Understanding HF radio systems
Understanding ionosphere
Understanding LF and HF propagation, G0KYA, G3NYK, RSGB (2010)
Understanding LUF and MUF
Understanding NVIS
Understanding of Ham radio propagation
Understanding of ham radio propagation: Amateur radio guide
Understanding of HF radio propagation
Understanding Propagation of Radio Waves
Understanding Propagation of Skywave
Understanding propagation numbers
Understanding propagation: How weather affects radio waves
Understanding propagation: How weather affects radio waves
Understanding Propagation: Paul L. Herrman, N0NBH (11-July 2010)
Understanding Propagation: WB5ANN.pdf
Understanding radio propagation: A graphical perspective
Understanding radio propagation
Understanding Radio Waves
Understanding radio waves and their frequencies
Understanding RF propagation: Types and properties
Understanding Radio Waves: Nature and Properties
Understanding Radio Waves and their Frequencies
Understanding Radio Waves: Nature and Properties
Understanding solar storms and how they impact ham radio
Understanding the basics of radio propagation
Understanding skywave propagation
Understanding solar activity and its impact on HF propagation
Understanding solar indices
Understanding space weather indices
Understanding the basics of HF band conditions
Understanding wavelengths and frequencies in ham radio
Usable Frequency Range
: from LUF to MUF
Usable HF frequencies
Uses of radio waves
Using HF beacon tracking programs
V
Validation of HF propagation models
Variations in HF radio propagation
Visualizing HF propagation
Verification of HF propagation models
Very High frequency
(VHF)
Very Low frequency
(VLF)
VHF propagation map
View HF bands conditions at a glance
Virtual height in wave propagation
Visualizing HF propagation
Voacap HF path prediction maps
VOACAP online
Voacap online HF predictions
VOACAP prediction
W
Watch Out for Geomagnetic Storms
Wave attenuation and absorption
Wave propagation
Weather influence on HF radio propagation
WebSDR
What affects radio signal
?
What affects radio wave propagation
?
What are band conditions banners
?
What are DX clusters
?
What are electromagnetic waves
?
What are geomagnetic disturbances
?
What are geomagnetic indices
?
What are geomagnetic storms
?
What are HF band conditions
?
What are HF band propagation conditions
?
What are ionospheric clouds
?
What are ionospheric conditions
What are ionospheric effects
?
What are ionospheric models
?
What are propagation indices
?
What are radio blackouts
?
What are radio waves
?
What are radio waves and how do they travel
?
What are solar flares
?
What are solar storms
?
What are space weather scales
?
What are sprites in Earth's atmosphere
?
What are sunspots
?
What are the amateur radio HF band conditions
?
What are the causes of Sporadic E
?
What are the current HF propagation conditions
?
What are the current shortwave propagation conditions
?
What are the disadvantages of HF radio
?
What are the ham radio HF band conditions
?
What are the different types of ionospheric propagation
?
What are the factors affecting RF propagation
?
What are the factors affecting ionospheric conditions
?
What are the geomagnetic indices
?
What are the modes of HF-radio propagation
?
What are the modes of radio propagation
?
What are the R-S-G scales in space weather
?
What are the regions of the ionosphere
?
What are the solar indices
?
What are the sources of medium and large scale traveling ionospheric disturbances
?
What bands and modes will give me voice at 5,000 kilometers
?
What causes ionospheric ionization
?
What causes the ionosphere to form
?
What controls HF propagation under normal conditions
?
What do propagation indices mean
?
What effect does the change of seasons have on HF propagation
?
What does a Grey line mean
?
What does the Solar Flux Index mean
?
What factors influence HF radio propagation
?
What frequency should I use for ham radio
?
What HF bands are allocated for radio amateurs
?
What HF bands are open at night
?
What HF frequency should I use
?
What impact do solar phenomena like sunspots and solar flares have on radio communications
?
What important quality does the ionosphere have
?
What is a geomagnetic storm
?
What is a good app or website to see HF propagation
?
What is an electromagnetic (EM) wave
?
What is Earth's magnetic field
?
What is earth Magnetosphere
?
What is fading
?
What is Geomagnetic Activity
?
What is Geomagnetic Disturbance
?
What is Ham Radio
?
What is ionization
?
What is ionospheric propagation
?
What is greyline propagation
?
What is Hale cycle
?
What is Ham radio propagation
?
What is HF propagation
?
What is HF radio propagation
?
What is HF radio propagation prediction
?
What is HF wave propagation
?
What is high-frequency (HF) radio?
What is ionization
?
What is K index
?
What is LUF
?
What is MUF
?
What is NVIS
?
What is plasma
?
What is radio
?
What is Radio propagation
?
What Is Radio Wave Propagation
?
What is RF propagation
What is sky propagation
?
What Is sky wave propagation
?
What Is Skywave propagation
?
What is solar activity
?
What is solar cycle
? |
Solar cycles: A tutorial
What is solar wind
?
What is space weather
?
What is the 80 meter band
?
What is the bandwidth of HF radio
?
What is the best HF band for daytime
?
What is the best HF band for DX
?
What is the best time for the 40 meter band
?
What is the best time of day for HF frequencies
?
What is the best time of day for HF radio
?
What is the composition of the ionosphere
?
What is the current HF propagation
?
What is the current LUF
?
What is the current MUF
?
What is the current lowest usable frequency (LUF)
?
What is the current shortwave propagation conditions
?
What is the current skywave propagation conditions
?
What is the dead zone in radio communication
?
What is the difference between solar proton flux and solar proton density
?
What is the difference between Greyline and the Solar Terminator
?
What is the difference between Global versus Regional HF propgation conditions
?
What is the difference between earth Magnetosphere and Earth's magnetic field
?
What is the difference between geomagnetic and ionospheric storms
?
What is the difference between solar indices and propagation indices
?
What is the D region of the ionosphere
?
What is the E region of the ionosphere
?
What is the F region of the ionosphere
?
What is the farthest a ham radio can reach
?
What is the K index for propagation
?
What is the longest range 2 way radio
?
What is the lowest usable frequency
?
What is the LUF frequency
?
What is the max radio range
?
What is the maximum usable frequency
?
What is the range of a 100 watt ham radio
?
What is the skip zone
?
What is the solar cycle
?
What is the solar index
?
What is the structure of the ionosphere
?
What is Total Electron Content
? TEC
What is virtual height
?
Where can I find solar data
?
What radio waves actually are
?
What the numbers mean in propagation
When will HF band conditions improve
?
Which ham band is open now
?
Which ham bands are open now
?
Which ionospheric region is closest to the Earth
?
Why do we need propagation forecasting
?
Why do we need propagation forecasts
?
Why does space weather affect ham radio
?
Why is HF propagation so poor
?
Why is HF used for long range communication
?
Why is propagation on shortwave (HF) terrible right now
?
Why is shortwave used for long range communication
?
Why is the ionosphere not included in the list of layers
?
Wide-band WebSDR
Window of usable frequencies
: from LUF to MUF
Working The Gray Line
Worldwide LUF chart
Worldwide MUF chart
WSPR
-
Weak Signal propagation reporter
*
WSPR Live
*
WSPR Rocks
WSPRnet
X
X-ray flares review
X-Ray flares
what are they?
X-Ray Flux Levels
Now
X-Ray Flux Levels
Scale
Total visits since 17 August 2022
.
Repeat visits counted as new after 24 hours.
The number of visits (graphs displayed below) peaks during HF propagation disruptions.
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