geomagnetic secular variation

地球電磁気学・超高層大気の物理学
Related terms (2)：

Milankovitch's cycle (ミランコビッチサイクル)
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Matuyama-Brunhes boundary (松山-ブリュンヌ境界)
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Broader terms (2)：

geomagnetic activity (phenomenon) (地磁気活動)
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secular variation (永年変化)
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