Contamination Effect of O1 Component on the Anomalous Seasonal Change of M2 Component in the Geomagnetic Lunar Daily Variations at Kakioka, Memambetsu and Kanoya, Japan, 1958-1973
Shiraki, M.
Abstract
Frequencies of the harmonic constitues of Ｍ２ and Ｏ１ components in the lunar daily geomagnetic variations differ by an amount corresponding to only one cycle per year. Consequently, Ｍ２ component determined for the seasonal subdivision contains a portion of Ｏ1 component. Therefore, we evaluate here the contamination effect of Ｏ１ component on the seasonal change of Ｍ２ component at three Japanese observatories, which was found in a previous paper(Shiraki, 1977) to be strikingly anomalous. However, in conclusion, it is shown that the anomalous seasonal change of Ｍ２ component is not caused by the contamination effect of Ｏ１ component.
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