The short history of the SSN Smoothed Sunspot Number at Luxorion
Magnetogram, Dopplergram Intensitygram by Mt. Wilson 150-Foot Tower Data Images
Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.
Global real time ionospheric foF2 map
These pages provide general propagation advice for HF communicators. Information available includes inferred global propagation conditions, real time HF fadeout coverage charts, regional ionospheric vertical MUF maps and Hourly Area Prediction charts for Astralia and Asia, Europe and North America
Web based VHF-UHF RF planning powered by SPLAT! and Google Maps. Access via website, Android App or dynamic Google Earth interface.
The understanding of the A and K indexes will become a very important issue when one begins serious HF operation.
Provisional international monthly mean sunspot number
Excellent presentation on RF skywave propagation by Greg, N6LYU
World data center for the sunspot index
Long path hf radio propagation is sometimes the best path to work dx, since the shortest path is not always the best path.
This is a highly informative map that can be used by amateur and professional radio communicators to determine maximum usable frequencies for any world-wide path at the indicated UTC (Zulu) time.
Introduction to shortwave propagation
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
This is about Small Antenna types and their properties which can help choosing proper
antenna for high-frequency wireless communications as: two-way radio, microwave short links,
repeaters, radio beacons or wireless telemetry
Nasa MSFC predictions on the behavior of current sunspot cycle.
A PDF document, used for ham radio training, that cover all aspects of radio wave propagation
Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast
This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station by G4UCJ