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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! u( O  _$ E8 Z4 q8 V
. z  Z; N- s8 e" `/ n6 [" L) r0 R; C3 {; q( O( n; V
+ i% P7 t6 L* e4 G6 S# ^8 [
(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:# D6 U4 a5 D7 M8 ~$ `0 w
, O$ [7 v, G6 {' b4 P3 G* u! c4 O) D
mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.; X/ \8 K$ J- e' W
( B5 I) O+ |5 l! @6 P; w! o
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).. l' y7 }$ h+ q! m
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