| definition |
- Geomagnetic - geocentric. Z axis is parallel to the geomagnetic dipole axis, positive north. X is
in the plane defined by the Z axis and the Earth's rotation axis. If N is a unit vector from the
Earth's center to the north geographic pole, the signs of the X and Y axes are given by Y = N x
Z, X = Y x Z.. See Russell, 1971, and .
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