Abstract
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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References
Ananthakrishnan, R., Nature, 170, 156 (1952).
Behr, A., and Siedentopf, H., Z. Astrophys., 30, 177 (1952).
Kleczek, J., Bull. Astro. Inst. Czechoslovakia, 4, 9 (1953).
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ANANTHAKRISHNAN, R. Geomagnetic Activity and the Sunspot Cycle. Nature 172, 854–855 (1953). https://doi.org/10.1038/172854a0
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DOI: https://doi.org/10.1038/172854a0
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