水路部磁i気点でのプロトン磁力計連続観測結果について

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タイトル別名
  • Geomagnetic Total Intensity Observation by Proton Magnetometer on the Geomagnetic Repeat Stations of Hydrographic Office
  • スイロブ ジキテン デ ノ プロトン ジリョクケイ レンゾク カンソク ケッカ ニ ッイテ

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Land magnetic observation for more than 24 hours on each 35 repeat station in Japan were carried out in 1969 and 1970 by Hydrographic Office of Japan. Geomagnetic inclination and declination were observed by earth-inductor type magnetometer for about every an hour. Total intensity was measured every minute by proton magnetometer. Observed data were compared with those of 4 geomagnetic permanent observatories in Japan. Mainly we examined the changes of total intensity on each repeat station. Daily variation of total intensity in Japan changes considerably day-to-day and placeto-place. Those are considered to be caused by changes of equivalent Sq current vortex and anomalous variation due to local conductivity anomaly of the under-ground structure. Among them we found phase delay of an hour for durnal variations of total intensity F on the stations along the coast of Japan sea from Hokkaido to Kyushu area compared to those of Pacific side of same area. These phase delay may be caused by conductivity anomaly mentioned above. Perkinson vectors obtained from observed total intensity data of short period variations on the repeat stations are shown here. At that case, we assumed that short period variations of horizontal component H and declination D were similar to those of nearest permanent observatories.

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