Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.
Nasa MSFC predictions on the behavior of current sunspot cycle.
Introduction to troposcatter or tropospheric scatter propagation using the troposphere
The understanding of the A and K indexes will become a very important issue when one begins serious HF operation.
Flash Movie describing HF (shortwave) radio propagation to beginners. Very helpful aid in understanding.
Images from the Solar Dynamics Observatory and Atmospheric Imaging Assembly
Online professional-grade high-frequency (3-30 MHz) propagation predictions
Broadcast via WWV and WWVH at 18 and 45 minutes past the hour. This message is updated every 3 hours.
Reports current Solar-terrestrial indinces, Solar Flux, A-index, K-Index, forecast for space weather storms.
Prepared by the US Dept. of Commerce, NOAA, Space Environment Center
Long path hf radio propagation is sometimes the best path to work dx, since the shortest path is not always the best path.
William Hepburn's Daily Tropospheric Ducting Forecast.
Near Vertical Incidence Sky Wave (NVIS) Propagation, PPT presentation by Marc C. Tarplee, Ph.D. N4UFP
KC¤DMH radio wave propagation notes with illustrations
A source for Information, links and images about the \"Northern Lights\" on-line since the Web began
Solar data with current solar status, forecast and propagation report
The charts on this page depict the progression of the Solar Cycle. The charts and tables are updated by the Space Weather Prediction Center monthly using the latest ISES predictions
Display a table of last 30 days sunspots reports.
Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Solar Region Data Current Regions with Sunspots Summary, an useful tool for predictions
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio. By region, updated monthy.
WM5R presentation of Introduction to Long-delaye echoes and theories among this propagation effect.