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Solar and Geomagnetic Activity Data

Copyright WDC C1 for STP at RAL.

Solar and Geo-Magnetic Activity Data

The data available are planetary magnetic indices such as Kp, Ap, Cp, and C9, and sunspot number. The database is updated monthly. Sunspot numbers for the latest three months are normally provisional.

The data cover the period from 1932 January 1.

Additional information available: