Propagation

• ARRL Propagation Forecast Bulletins
• AD5Q's Propagation Forecast
• Australian Ionosphere Prediction Service
• Australian Space Forecast Center
• Communications Analysis Prediction Wizard
• Critical E-layer frequency maps
• Critical F2-layer frequency maps
• Current Solar Images at NOAA
• DX and Radio Propagation
• DXBANDS.COM
• DX SUMMIT
• Grey Line Real-Time Map
• GSC North Pole
• Ham Radio Online Magazine Propagation Resource List
• Ham Radio Online Magazine World Wide Propagation Conditions
• High Frequency Active Auroral Research Program
• HF Propagation Models
• HFRADIO.org
• Hourly MUF maps with auroral zone and greylines
• Ionospheric Physics Group
• IPS Sydney RWC Index Page
• K-Index Plot - US Air Force, Space Forecast Center
• K1TTT MOF/LOG Propagation Program
• Latest Solar Images from NASA
• Maximum heights of the F2-layer maps
• NOAA Current Solar Forecast (SF & A indices)
• NOAA's Radio Information Page
• Primer on the Space Environment
• Propagation Bulletin
• Propagation Models and Prediction Software
• Propagation Report
• RSGB Propagation Studies Committee
• SOHO - Solar and Heliospheric Observatory
• Solar Activity
• Solar Elevation (Zenith) Angle Maps
• Solar Flux
• Sunrise
• Solar Terrestrial Dispatch
• Sun Spots
• Sunspot Index Data Center
• Sunspots and the Solar Cycle
• Topband - 160 meter Radio Propagation
• WM7D - Solar
• WWV Numbers