Report of solar & geophysical activity

Automatic e-skip and aurora alerts via email or SMS, it sends also latest dxspots via email.

A daily LF/MF/HF radio propagation forecast.

Global real time ionospheric foF2 map

Auroral Large Imaging System, ALIS

Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast

ARRL propagation prediction charts in PDF Formats

The past and future of the Sun's solar cycle and possible impact on the Earth's climate.

Free real-time Earth Space 4-D global 4-D ionosphere using Google Earth, by CAPS/ES4D Gateway

Sunspot Numbers, The Butterfly Diagram, the Greenwich sunspot data and sunspot realted infos.

William Hepburn's Daily Tropospheric Ducting Forecast.

About ground wave, article by moonraker.com.aut

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.

Near Vertical Incidence Sky Wave (NVIS) Propagation, PPT presentation by Marc C. Tarplee, Ph.D. N4UFP

Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.

Solar Region Data Current Regions with Sunspots Summary, an useful tool for predictions

W0RW article that guide you to using beacons to determine dead bands or upcoming propagation openings.

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 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