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

7 K: W: }+ F$ s
0 D5 D. T. I  H# I4 V* D; G1 W
(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:
: {7 z* W# P( h. C
0 O/ C; C" n' A' z0 f: ?mz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
9 F) k. r! {1 ^+ B7 d* x8 o: ~6 ^! v
) W: l* h* C; h$ X& MCalculate 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).
' J  J. D1 O- }6 \4 y. ]5 u- z