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

. e, ]& |/ d) a: o$ ?
7 X% s) [. ?& L; j* ]* T9 D
6 L4 f& h3 L  ^! v- U( v, U(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:

. `1 s3 t# g+ }# Amz = -7.7 x 1022 A m2, mx = -0.479 x 1022 A m2, my = 1.399 x 1022 A m2.
( {5 S* A! k0 ~% _# T9 u
8 b1 s) F/ j$ e: QCalculate 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).
7 B+ d/ |8 Q- C% r, o3 W