...(1) includes geomagnetic variation meters, which use a mirror to magnify the movement of a suspended magnet, and are used to observe the daily variations in the geomagnetic field and magnetic storms. The astatic magnetometer, which was used in the 1950s and 1960s to measure the natural remanent magnetization of rocks, and the magnetic balance, which measures the saturation magnetization and magnetic susceptibility of magnetic materials, use the principle of (1). (2) includes magnetic sensors that use the electromotive force generated by rotating a coil in the geomagnetic field, and the Geospatial Information Authority of Japan magnetometer, which combines this with a telescope, the latter of which is used to measure the three components of the geomagnetic field. ... *Some of the terminology explanations that mention "astatic magnetometer" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(1)には,つるした磁石の動きを鏡で拡大する地磁気変化計があり,地磁気の日変化や磁気あらしの観測に使われる。1950‐60年代に活躍した岩石の自然残留磁化測定用の無定位磁力計(アスタティック・マグネトメーター)や,磁性体の飽和磁化や磁化率を測定する磁気てんびんは(1)の原理を利用している。(2)には,コイルを地磁気中で回転させて生じる起電力を利用する磁気感応儀や,これに望遠鏡を組み合わせた地理院型磁力計があり,後者は地磁気3成分の測定に利用する。… ※「アスタティック・マグネトメーター」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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