ips-tindex-predictions -- IPS Observed and Predicted T Indices
About ips-tindex-predictions	English (USA)
A table of observed and predicted values for the IPS T Index. The T Index is a measure of the behaviour of the F-layer of the ionosphere and is used as an input for the IPS HF frequency prediction program ASAPS. The T-index is calculated from the vertical MUF (foF2) obtained from IPS ionograms combined with the IPS world map grid point data. The grid point data form the IPS world maps of foF2, there are 576 maps, for two ionosheric levels (T=0, T=100), 12 months, and 24 hours. An foF2 observation can be converted into a Tindex by interpolation/extrapolation of the line obtained from the maps at a geographic location ie two map T,foF2 value pairs and the observed foF2, then read off the corresponding T value. The IPS maps are not available for distribution, as they are part of the intellectual property of IPS. More background information on the IPS Tindex is available here. The Tindex is predicted over a coming solar cycle to provide a long term ionospheric index trend for HF communicators. This report is usually issued soon after the start of each calendar month. Ionospheric data is avilable for download from the IPS World Data Centre at: IPS WDC Ionospheric Data To see the collection of prior postings to the list, visit the ips-tindex-predictions Archives.
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