Geomagnetic secular variation

Estimated declination contours by year, 1590 to 1990 (click to see variation).

Geomagnetic secular variation refers to changes in the Earth's magnetic field on time scales of about a year or more. These changes mostly reflect changes in the Earth's interior, while more rapid changes mostly originate in the ionosphere or magnetosphere.

单词	Geomagnetic secular variation
释义	Geomagnetic secular variation 英语百科 Geomagnetic secular variation Geomagnetic secular variation refers to changes in the Earth's magnetic field on time scales of about a year or more. These changes mostly reflect changes in the Earth's interior, while more rapid changes mostly originate in the ionosphere or magnetosphere.
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