[HCDX] Article about new ionosphere index

["Eike Bierwirth" <Eike.Bierwirth@xxxxxx>]

Here is a recent research paper about a new index that describes the state of the ionosphere.

http://www.ann-geophys.net/28/2227/2010/angeo-28-2227-2010.html



73,
Eike














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