A. Chambodut - EOST, Strasbourg
V. Mendel - EOST, Strasbourg
A. Corvée & B. Spitalier - EOST, Strasbourg
Texts are largerly inspired from H. McCreadie and M.Menvielle - A guide to geomagnetic indices derived from Earth' surface data (submitted)
These data are calculated by ISGI Collaborating Institutes
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