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单词 Geomagnetic pole
释义

Geomagnetic pole

英语百科

Geomagnetic pole

Illustration of the difference between geomagnetic poles (Nm and Sm) and geographical poles (Ng and Sg)

The geomagnetic poles are antipodal points where the axis of a best-fitting dipole intersects the Earth's surface. This dipole is equivalent to a powerful bar magnet at the center of the Earth, and it is this theoretical dipole that comes closer than any other to accounting for the magnetic field observed at the Earth's surface. In contrast, the actual Earth's magnetic poles are not antipodal—that is, they do not lie on a line passing through the center of the Earth.

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