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[其他] 求助一到地球物理的题

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发表于 2012-4-2 21:27 | 显示全部楼层 |阅读模式
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知道地球磁场的single dipole moment Mx, Mz,My如何求 相交的位置
- c# s* t, J& o* d; ?6 b3 y! K
! v7 b6 r6 V8 N  p1 h, L' Q" W$ t1 i6 H1 n6 o7 j' K( x
4 E: t. ?3 `7 C- M, S6 X: V
(2) The Earth’s main magnetic field at the surface (radius = 6371 km) can be approximated by a single dipole moment at the Earth's centre with the following (x,y,z) components:
+ M2 p7 O! P* T- K$ D9 b  `8 D- ?8 c9 v" n1 e2 I+ f# r
mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.* A+ H) X$ O: \0 @# _: O
; X! c: L; ^6 L1 i! e2 X
Calculate the location (latitude, longitude) where the axis of this dipole field intersects the Earth's surface (i.e. where the magnetic field is locally purely vertical and upward)./ q1 _3 V: ^' F  J8 O
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