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HomeHF SystemsGlobal HFT Index Map Wednesday, Aug 24 2016 16:11 UT
Global HF

T Index Map

This image shows the difference between current observed hourly conditions and predicted monthly conditions for the global ionosphere. Depressions and enhancements are with respect to the SWS predicted monthly T index for that month.

Global Ionospheric Map

Colour legend

Colour Conditions
blue enhanced
green normal
yellow mildly depressed
red depressed

Note: The foF2 values used in the T index mapping process are based on the median of the last 2 hours of station data. This may mean that the map may lag actual ionospheric behaviour, particularly after local dawn.

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