田中舘愛橘と磁気嵐急始の問題

概要

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The present paper reveals the international and domestic activity of Aikitu Tanakadate (1856-1952) on the subject of sudden commencements (shortened into SC) of geomagnetic storm. His activity for SC has scarcely been known at present. His activity is described for three periods in this paper. In the first period (1903-1923), he made efforts for the establishment of geomagnetic observatories in Japan, and for the observations of SC's and geomagnetic pulsations, according to the suggestion in the international meeting. He did not participate in the international network of SC investigation in this period. In the second period (1924-1930), he took an active part in SC investigation as the chairman of the international committee of magnetic storm SC, on the recommendation of L.A. Bauer, a well-known American scientist for terrestrial magnetism. In the third period (1930-1940), he took again an active part as the chairman of the international committee for magnetic storm SC, at the time of the Second International Polar Year (1932-1933). He often reported SC data observed in Japan, at the international meetings.