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 NOAA > NESDIS > NCEI (formerly NGDC) > Geomagnetism

Models are joint research with:
The Cooperative Institute for Research in Environmental Sciences (CIRES).

Geomagnetic Indices

There are numerous indices of magnetic activity. The International Association of Geomagnetism and Aeronomy (IAGA) offically recognizes magnetic indices aa, Am, Kp, Dst, and AE. More information about the IAGA indices is available from ISGI - International Services for Geomagnetic Indices (off-site).

More information about magnetic indices is available from: