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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