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ホーム > 刊行物 > 地磁気観測所要報 別冊 第05号 > 地磁気観測所要報 別冊 第05号 >Base-Line Value Stability of Geomagnetic Variometer

地磁気観測所要報 別冊 第05号, p.185, March, 1975


Base-Line Value Stability of Geomagnetic Variometer


Yanagihara, K.


Abstract

 Base-line value changes of KM-type H-variometers used at three observatories, Kakioka, Memambetsu and Kanoya, for the 1960's are analysed.
  Their stabilities are good and the change in each variometer is expressed by a single function of time and temperature for a long time. In practical use of the relation,calculated values are as accurate as the absolute measurement by good magnetometers.
  A new term of out-of-phase change is found in the relation for annual temperature variation. Though it is small in general,the term should be taken into consideration for precise determination of base-line values with accuracies better than 1γ.



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