The local activity indices are defined as absolute mean deviations of the current horizontal component of the geomagnetic field at the location relative to the previous days mean value.

The local geomagnetic activity indices are generated and provided by University of Tromso for a list of magnetometers. After generation the data is directly transferred to this website and provided here for the AFFECTS consortium members and registered users.

All activity index values are updated hourly, while k index values per definition are 3 hourly.

Additional Magnetometer data is available at University of Tromso:

http://flux.phys.uit.no/geomag.html

The local geomagnetic indices are basically used for the monitoring of the auroral geomagnetic activity and for validation of the early warning messages.

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