PropNET is an ad-hoc 2-way (and potentially, "more-way") RF-based digital communication network whose activity is reported on the Internet. As participating stations periodically ID and exchange data, they report their activity to an Internet data-collection hub for presentation through this web site.
Army Field Manual 24-18 Appendix M with Graphics
A daily LF/MF/HF radio propagation forecast.
In the past few years there has been a growing movement from VHF frequencies (50-300 MHz) to UHF (300-900 MHz). Many, however, have found the move fraught with difficulties.
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
This map represent the current position of the sun and how a solar flare influence an HF fade. Estimated recovery time is also represented. Includes son java and javascript animations of last two hour conditions
Solar Region Data Current Regions with Sunspots Summary, an useful tool for predictions
Amateur radio propagation studies (science, research, engineering, operating) and the BeamFinder propagation analysis software
William Hepburn’s Daily Tropospheric Ducting Forecast.
Global real time ionospheric foF2 map
Thierry LOMBRY, ON4SKY, develops in several long articles the bascis of propagation. His website includes also a French section dealing with auroras.
A PDF document, used for ham radio training, that cover all aspects of radio wave propagation