Simultaneous Comparisons of CA Transfer Functions among Memambetsu，Iwaki，Kakioka and Kanoya
Sano, Y., Nakaya, K., Kurihara, T. & Nakajima, S.
Abstract
Simultaneous comparisons of CA transfer functions mainly for the period of 90 min among Memambetsu, Iwaki, Kakioka and Kanoya and have been carried out during the short epoch from Jan. 29 to Apr. 4, 1978. The transfer functions at each station are calculated by the quite same way, the least square method for Fourier transforms of many common geomagnetic disturbances.
Time changes of the transfer functions at these four stations which are located at the north and south edges of Japan and nearly in the central part are so well-correlated that all of them might be caused by a common origin except the Au transfer function at Memambetsu. The Au transfer function at Memambetsu is scarcely changed through the whole epoch. The correlation between Kakioka and Iwaki located near each other is in general highest and lowest between Memambetsu and Kanoya located at the longest distance. All mean amplitude of the time changes are greatest at Iwaki and smallest at Memambetsu, though there are some great differences for different transfer functions and/or from station to station.
At the present stage it cannot be sufficiently decided whether the above well-correlated time changes in transfer functions are caused by the internal or external origin of the earth. But it may be certain that these time changes are of quite wide scale like one of the central Japan anomaly region or of the whole Japan.
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