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:
& `& K$ ?* c9 c7 k4 e
) C* U5 _+ @' b' v) _/ @mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
* g; A( C2 G6 j
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).