Online professional-grade high-frequency (3-30 MHz) propagation predictions
William Hepburn's Daily Tropospheric Ducting Forecast.
This page contains dynamically updated propagation information.
Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.
The Estimated 3-hour Planetary Kp-index plot
A source for Information, links and images about the \"Northern Lights\" on-line since the Web began
A PDF document, used for ham radio training, that cover all aspects of radio wave propagation
Current status, prediction, solar weather for the solar cycle 24 by VE3EN
Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast
A collection of ad Hoc empirical comments on VHF radio waves propagation by Pete Heins N6ZE
Assembled from a prediction model written by VE5ZX/G0TZX, from parameters supplied by G4FKH
11 Years of monthly propagation reports from February 1988 to January 1999 by AD5Q
Understanding basic VHF and UHF propagation, eskip, Backscatter, Meteor Scatter and more
By Ken Larson KJ6RZ, a complete guide to understanding soloar indices and values.
The Report and Forecast of Solar and Geophysical Activity is the primary daily report prepared by SEC. It provides a summary and analysis of solar and geomagnetic activity during the previous 24 hours as well as the most recent solar indices. It also provides a forecast of activity and indices for the next 3 days.
Excellent presentation on RF skywave propagation by Greg, N6LYU
Add Solar-Terrestrial data to your website, by adding a simple html code to your pages by Paul L Herrman
Some test circuits using the ACE-HF System Simulation & Visualization software, about reciprocal propagation on HF bands by NW7US
Two modes of propagation at 50MHz E-layer & Sporadic-E by Ken G4IGO