求助一到地球物理的题

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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
& n' g) i# ?/ }4 z4 i( P+ r- I# e
/ V. t. _' N( h7 \" I; }: W# Q
3 Y% l1 A+ e6 Q  J+ M9 A
(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:
3 ]$ B: R6 l) h+ U% V
: `% h/ j" g+ u. Smz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.

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).
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