Abstract
It is well known that Pc type pulsation occurs simultaneously in the world wide region. The author examined the records of induction magnetometer at the Japanese four stations (Memanbetsu, Onagawa, Simosato and Kanoya). Results are as follows.1) The local Pc occurs frequently during daytime.2) The maximum of occurrence frequency of local Pc lies in equinox, and the minimum lies in winter.3) The frequency of occurrence of local Pc depends on local mean time, and the maximum frequency of it's occurrence lies around 13h (L. M. T.).
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