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
. Y( Y7 w: z9 }+ }6 E2 B; H


(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:
" w7 `% z" ?: U* r) L3 n; q7 V3 z) a
" N! J, Y/ V) _  w* l; lmz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
, V8 J; Q* N. {$ ~
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).