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
' o0 Y7 M4 I4 u+ U) G0 F& a

: G8 b: ?& E! ?4 ]5 ?* m' [
& ?  R* W6 W8 z& J7 y(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:

! r# o% ~* v: s# Ymz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
2 n' w; U+ H" L) G: U
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).