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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
3 Z7 {& f. u% c$ \9 ?: Q5 r; f( b9 n7 {5 {* m
1 \+ E2 G* b' V1 }3 `

6 v8 n  ?9 I$ y# E' W8 g$ p(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:+ e2 \$ K" A* b; c
+ h0 n+ B( i9 y6 x2 U
mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
  r) y' ~+ W& j) ~* R4 N9 H/ ?. [% e6 K2 ~! x7 m8 ]3 g! q4 U0 \1 u
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).
" z' H/ p5 G8 j: w
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