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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5 Q- a  i8 w" c

! r, h$ \' J5 W  ]- O1 S
8 t3 Z- \$ {5 K/ y3 F8 a4 O" q% ?8 \7 O1 }1 h. `8 K8 ^. q
(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:% ~  }0 M2 w4 h% W2 }

; W& A- b* |8 ?8 n1 W3 nmz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.9 U" x- `* L3 B" s0 p

! t4 F. J1 W6 h* H1 r! }  SCalculate 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).
1 N  W% D6 _2 H: Y2 ]4 F
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