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HomeHF SystemsGlobal HFT Index Map Tuesday, Oct 23 2018 06:08 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

See also a 0 degree longitude centred map.

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