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ホーム > 刊行物 > 地磁気観測所要報 第14巻 第02号 > 地磁気観測所要報 第14巻 第02号 >The Anomaly of Geomagnetic Variation in Japan(Part W)

地磁気観測所要報 第14巻 第02号, p.93, March, 1972


The Anomaly of Geomagnetic Variation in Japan(Part W)


Kuboki, T.


Abstract

 Many investigators have already researched that there are very small local characteristics in Japan on the geomagnetic rapid variation. The relation between the three components(ΔH, ΔD and ΔZ) of the magnetic rapid variation vector is approximately expressed by the following formula, ΔZ=A・ΔH+BΔD.
  In this paper, the author determined the coefficients A and B at Nemuro (145°35'E, 43°20'N), Rebun (141°03'E, 45°20'N), Wakkanai (141°41'E, 45°24'N) and Yuzhno Sakhalinsk (Toyohara) (l42°42'E, 46°57'N). The values of A and B are from -0.03 to 0.35, and they are relatively small compared to those of the Central Japan. The change of A and B due to the duration of variation is small at Nemuro, Rebun and Wakkanai, but at Yuzhno Sakhalinsk (Toyohara) the values of A, B are -0.03 and 0.16 when the duration is 0.5〜2 minutes, and 0.02 and -0.16 when that is 4〜50 min. And at Yuzhno Sakhalinsk (Toyohara), the vertical intensities of the rapid variations of which duration are 2〜3 min., are very complicated and ΔZ/ΔD's take the positive or negative signs.
  The vector S seems to tend towards the direction of the center of Hokkaido.



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