ISGI is the Reference service of the International Association of Geomagnetism and Aeronomy (IAGA) for validation, dissemination and stewardship of geomagnetic indices (with the help of 6 ISGI-Collaborating-Institutes internationally spread) through its official Web portal.

ISGI is an official French National Service of CNRS-INSU which is getting a double label, both in «Solid Earth» TS‑ANO4 (National Observation in Magnetism) and in «Astronomy-Astrophysics» AA‑ANO6 (Surveillance of the Sun and the Earth’s Space Environment).
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