Global map of Solar Zenith Angles, or angles indicating the elevation of the sun above the horizon
15 possible explanations for Long Delayed Echoes by University of Oslo
Concise guides to radio signal propagation including topics such as the ionosphere, troposhere, ionospheric refraction, E layer, D, layer etc.
Online professional-grade high-frequency (3-30 MHz) propagation predictions
The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems.
The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts.
Automatic e-mail alert of propagation information. Gives current solar flux, Ap, Kp, solar wind information, solar and geomagnetic conditions past and forecast, sunspots, aurora index, and more.
Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast
DX Propagation by DR2W! High resolution SNR maps in pseudo color. Propagation based on the actual sunspot number.
Sounds of Space Weather by S. McGreevy, N6NKS
This is a propagation prediction program tailored to the serious contester
World data center for the sunspot index
160 Meter Radio Propagation Prediction Table
Assembled from a prediction model written by VE5ZX/G0TZX, from parameters supplied by G4FKH
F2 and TE propagation on 6 meter
Refractive Index maps forecast for Europe
Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio. By region, updated monthy.
Display a table of last 30 days sunspots reports.
Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center
Live space weather and propagation data, in RSS (XML) format.