Maps and propagation indices
This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space.
The map shows the radio auroral zones as green bands near the northern and southern poles.
Flash Movie describing HF (shortwave) radio propagation to beginners. Very helpful aid in understanding.
Automatic 144MHz E-skip Alerts for North America
Introduction to troposcatter or tropospheric scatter propagation using the troposphere
The Estimated 3-hour Planetary Kp-index plot
Current status, prediction, solar weather for the solar cycle 24 by VE3EN
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
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio. By region, updated monthy.
VHF, ms, aurora, es, photos, audio, link, soft and more.
Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.
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.
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.
Website dedicated to vhf radio aurora operations by KG0VL
Nasa MSFC predictions on the behavior of current sunspot cycle.
How to understand when a new solar cycle starts.
At the beginning of a new solar cycle, sunspots tend to form at high latitudes, but as the cycle reaches a maximum the spots form at lower latitudes.
Live space weather and propagation data, in RSS (XML) format.
Assembled from a prediction model written by VE5ZX/G0TZX, from parameters supplied by G4FKH
Report of solar & geophysical activity
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