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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Dataset Last Updated: January 01, 1957 at 12:00 AM

The geomagnetic aa indices are the continuation of the series beginning in the year 1868. A full description of these indices is given in the International Association of Geomagnetism and Aeronomy...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Dataset Last Updated: January 01, 1968 at 12:00 AM

The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) receives, on a monthly basis, indices that are based on the data from two approximately...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Dataset Last Updated: January 01, 1955 at 12:00 AM

The Geomagnetic Indices Bulletin is a one page sheet containing the magnetic indices Kp, Ap, Cp, An, As, Am and the provisional aa indices. The bulletin is published monthly.

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