Live space weather and propagation data, in RSS (XML) format.
William Hepburn's Daily Tropospheric Ducting Forecast.
The charts on this page depict the progression of the Solar Cycle. The charts and tables are updated by the Space Weather Prediction Center monthly using the latest ISES predictions
DX Propagation by DR2W! High resolution SNR maps in pseudo color. Propagation based on the actual sunspot number.
By Ken Larson KJ6RZ, a complete guide to understanding soloar indices and values.
The short history of the SSN Smoothed Sunspot Number at Luxorion
This is a propagation prediction program tailored to the serious contester
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.
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
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.
Web based VHF-UHF RF planning powered by SPLAT! and Google Maps. Access via website, Android App or dynamic Google Earth interface.
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.
Propagation forecast for current month edited by I2MQP in italian
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.
The understanding of the A and K indexes will become a very important issue when one begins serious HF operation.
Prepared jointly by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and the U.S. Air Force.
NOAA / Space Weather Prediction Center, Geomagnetic K-indices and Running A-indices, Local Noon Solar Radio Flux, Daily Solar Indices with SSN
Nasa MSFC predictions on the behavior of current sunspot cycle.
Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities
About Long-delayes radio exchoes at wapedia