... magnetic screening 磁屏蔽 magnetic secular change 地磁长期变化 magnetic semiconductor 磁性半导体 ...
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... geomagnetic seasonal variation 地磁季节变化 geomagnetic secular variation 地磁长期变化 geomagnetic storm 地磁暴 ...
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测区内未发现有局部地磁长期变化异常。
No anomalous local secular geomagnetic variation has been found in the area.
本文利用1958 ~ 1995年已正式出版的《地磁观测报告》资料对广州地磁台地磁场的长期变化进行分析研究。
According to the observation data at Guangzhou geomagnetic observatory from 1958 to 1995, we summarize the laws of the geomagnetic secular variation in Guangzhou geomagnetic observatory.
利用地磁场模型资料，计算和分析了公元0 ~ 2000年的地磁场偶极子磁矩和地磁北极位置的长期变化。
With geomagnetic field model records, several kinds of secular variation of geomagnetic dipole moment and the position of the geomagnetic North Pole during the year 0 ~ 2000 a.
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