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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
  j, i( r' s) g4 f
& H/ ~; Y% y/ U8 E% H% K' L! T2 I, a0 a) h' v( S$ J
. M- g) w: g& E- {9 g8 @9 J
(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:
5 c9 u9 k# s+ u" d& ~6 R$ k2 W1 y1 \2 x. z' a5 n
mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
4 @1 y0 |/ ^: \5 `
" ~0 w: e# x. Z/ h4 Q$ N9 lCalculate 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).% k3 P+ y( y! N8 v% g' A( ]' ~
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