I"></a>ISGI &#8211; International Service of
Geomagnetic Indices.<span style="font-weight: bold;"> </span></span><span style="font-family: MS Sans Serif; font-weight: bold;">I</span><span style="font-family: MS Sans Serif;"><span style="font-weight: bold;">ndices: Data</span></span><span style="font-family: MS Sans Serif; font-weight: bold;"> </span><a style="font-family: MS Sans Serif;" href="http://isgi.cetp.ipsl.fr/">http://isgi.cetp.ipsl.fr/</a><span style="font-family: MS Sans Serif;">. Access in
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