Radio-propagation depends on ionosphere current electrical properties, the later being in turn constrained by Space Weather conditions.
In a previous page of this website (look here) a comparison was made between the Terrestrial ("classic") and Space Weathers. At the bottom of that comparison table, the term "index" was introduced and it was shown that both weather forecasts are based on the analysis of their value and fluctuations.
As Space Weather investigates various correlated phenomena, the number and type of indexes is quite high. The various indexes apply to different topics (Solar activity, Geo-magnetism, Auroras, ...), are either local or global and are collected/derived with different time frames. Browse her to learn more about various Space Weather indexes.
Propagation Predictor
By clicking on the following "Current Conditions" button, you will first update the values of the main Space Weather indexes and then, based on these, receive an indication (in the form of a traffic-light code) of present propagation condition in the various bands.
The various indexes used here are :
The Kp index
Look here at the latest estimated Kp index (from NOAA/SEC)
The Ap index
The Sunspot Number index (R)
Look here for the estimated Ap, R and F10.7 indexes (from DXLC)
Intermediate Level Expert Level