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ホーム > 刊行物 > 地磁気観測所要報 第21巻 第02号 > 地磁気観測所要報 第21巻 第02号 >Variations in the Nighttime Geomagnetic Total Intensity

地磁気観測所要報 第21巻 第02号, p.65, March, 1986


Variations in the Nighttime Geomagnetic Total Intensity


Fujita, S., Okamoto, A. & Yoshimori, Y.


Abstract

 Geomagnetic secular variation in Japan relative to Kakioka is intensively investigated using night time geomagnetic total intensity in 1977-1985. One of the important characteristics of the secular variation is that an outstanding oscillatory variation with the period of 4 - 5 years is superposed on the long-term secular variation at the observation points far from Kakioka. This variation occurs by variation of the equatorial ring current intensity with two peaks in one solar cycle. A second one is that effect of ocean currents is important for stations in islands (Hachijo). Finally, it is found that a clear annual variation appears in difference between the night time horizontal intensity of Memambetsu and that of Kakioka.



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