This page provides access to plots of several indices of solar and geomagnetic activity that are frequently used as inputs to space-weather models. Brief definitions of each of the indices plotted are as follows:
The data shown in these plots came from the following sources:
If you would like to get a feel for how effective these effective-SSN indices are, foF2 plots comparing the observations with model foF2 values calculated using the NWRA SSNE and SWS T values are available. There is a one-day delay between the latest SSNe values available and these plots to permit more data to arrive at the NOAA NCEI for comparison.
If you are interested in further information regarding ionospheric radio propagation, the Radio Society of Great Britain Propagation Studies Committee has a large collection of links to things propagational.
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