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
. c0 k, N: ^6 r" w5 a: W# x- c) P, _
  ^  I# P/ _) W5 K  C$ w! Q! J
9 X, T1 C; v# h; [+ M
(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' R3 v  w; O
% @  \- D0 c5 E& p3 Emz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
. z2 C3 U3 Z9 D; _/ P, e
( B1 t* |5 @- o2 B7 t5 P) rCalculate 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).