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



1 N1 Q7 ?' Z7 [; i7 m# \& B# E(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:
* ^& {: B+ |# }, P2 {5 |  Z* Y, q
9 e% w$ r6 U5 t/ v, S! {# Gmz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
( D, |6 z+ o0 s+ S
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).
& `; I0 v2 B  F# w7 e& g/ |9 a