求助一到地球物理的题

cookgao1992610

知道地球磁场的single dipole moment Mx, Mz,My如何求 相交的位置
6 U" k3 T1 w/ l+ j
% `; j, t+ X3 }& Z2 g

(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 Z( p+ V; u1 E; \9 |mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.

; M* ^0 r, b9 N6 jCalculate 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).
$ O( `5 y$ E2 p8 G* V+ x# }4 E