The International Service of Geomagnetic Indices (ISGI) is in charge of the elaboration and dissemination of geomagnetic indices, and of tables of remarkable magnetic events, based on the report of magnetic observatories distributed all over the planet, with the help of ISGI Collaborating Institutes.
The interaction between the solar wind, including plasma and interplanetary magnetic field, and the Earth's magnetosphere results in a transfer of energy and particles inside the magnetosphere. Solar wind characteristics are highly variable, and they have actually a direct influence on the shape and size of the magnetosphere, on the amount of transferred energy, and on the way this energy is dissipated. It is clear that the great diversity of sources of magnetic variations give rise to a great complexity in ground magnetic signatures.
Geomagnetic indices aim at describing the geomagnetic activity or some of its components. Each geomagnetic index is related to different phenomena occurring in the magnetosphere, ionosphere and deep in the Earth in its own unique way. The location of a measurement, the timing of the measurement and the way the index is calculated all affect the type of phenomenon the index relates to.
The IAGA endorsed geomagnetic indices and lists of remarkable geomagnetic events constitute unique temporal and spatial coverage data series homogeneous since middle of 19th century.
The 6 ISGI Collaborating Institutes are: EOST (Ecole et Observatoire des Sciences de la Terre, Strasbourg, France), GFZ (Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum Adolf-Schmidt-Observatorium, Potsdam, Germany), Observatori de l'Ebre (Roquetes, Spain), WDC Kyoto for Geomagnetism ( World Data Center for Geomagnetism, Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Japan), DTU Space (DTU Space, National Space Institute, Lyngby, Denmark) and AARI (Arctic and Antarctic Research Institute, St.Petersburg, Russian Federation) [see: http://isgi.unistra.fr/collaborating_institutes.php].
The indices of geomagnetic activity and lists of remarkable events derivation, meaning and availability are available at: http://isgi.unistra.fr/geomagnetic_indices.php.
ISGI headquarters have been moved from LATMOS (Guyancourt, France) to EOST(Strasbourg, France) in 2014.