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



(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:
( f/ ~( }0 q, s. Y1 @9 B# [# ^
* k1 v* {! i1 O$ b/ x& G% Imz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.

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).
, q$ Y" [8 K! e$ G. R/ N- p$ w