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).

• AA* Index (Major magnetic storms list)
• Auroral Electrojet Index (AE) (High resolution and hourly data)
• Ap* Index (Major magnetic storms list)
• Disturbance Storm-Time (Dst) Index
• Proposed Est and Ist Indices
• Kp and Ap indices
• Geomagnetic Indices Bulletin

More information about magnetic indices is available from:

• GFZ Potsdam (off-site)
• WDC Geomagnetism, Kyoto (off-site)
• WDC Geomagnetism, Copenhagen (Data service is moved to WDC Edinburgh )
• WDC Geomagnetism Edinburgh, UK (off-site)
• Observatory de l'Ebro (off-site)