INSU
IAGA

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FAGS
CNES

ISGI PRESENTATION LIST OF GEOMAGNETIC OBSERVATORIES INDICES: DERIVATION AND AVAIBILITY INDICES: DATA
LONGITUDE SECTOR ACTIVITY INDICES MUSICAL DIAGRAM MONTHLY BULLETIN SELECTED PAPERS

The following quick-look values of Kpa indices are automatically computed and made available about 30 minutes after the end of the corresponding 3-h interval. The minute values are provided by Hartland and Canberra observatories on a 10' basis.
DateKpa_3h_ind (quick look values)Aa
20/05/133-2o1+1+3-3-3-1+ 18
21/05/133-- - - - - - - 24

PRESENTATION

Geomagnetic indices and lists of remarkable geomagnetic events constitute data series aiming at describing at a planetary scale the magnetic activity, or some of its components. The data series are homogeneous since 1868 for aa and the list of ssc, 1932 for Kp, 1953 for the list of Sfe, 1957 for Dst and 1959 for am.

The International Service of Geomagnetic Indices (ISGI) is in charge of the elaboration and dissemination of geomagnetic indices, and of lists of remarkable magnetic events with data provided by geomagnetic observatories.

The basic activities of ISGI are then to prepare and circulate these data with the help of the following ISGI Collaborating Institutes:

ISGI and ISGI Collaborating Institutes have the responsibility to ensure the homogeneity of the data series. ISGI is a body of FAGS. It has an advisory board, appointed by the Executive Committee of the International Association of Geomagnetism and Aeronomy (IAGA). ISGI is part of the French BCMT (Bureau Central du Magnétisme Terrestre).

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