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
# q$ M' Q2 n0 M) ?+ {

# u3 n/ K/ u; J7 v; n
) H8 K3 Q$ u8 m3 |. ^  o(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:

/ V4 W+ f4 b5 b' n& I& x% vmz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.

) V! w$ E: ~+ O; X9 pCalculate 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).