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
- e3 ]% _! k, T3 h
( o$ Z0 @1 t$ S3 ?; K) G
7 R+ w1 U% ]' n9 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:

% k6 @0 B% R9 k$ e! k, Fmz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
9 {. A, s& d+ g5 u2 H/ M4 u) r
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).