Geomagnetic activity and the sunspot cycle

Ananthakrishnan, R. (1953) Geomagnetic activity and the sunspot cycle Nature, 172 . pp. 854-855. ISSN 0028-0836

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It is well known that the daily international magnetic character figure C i constitutes a valuable index for classifying days according to their magnetic activity averaged over a large part of the earth. As a measure of the intensity of geomagnetic disturbance, C i is in fact comparable to the Zurich relative sunspot number S, which is a recognized measure of solar activity. Daily C i values are available in an unbroken sequence from 1884 onwards.

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