Alternate Definitions for DM

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Term: DM
Definition:

Dipole Meridian - A coordinate systemcentered at the observation point. Z axis is parallel to the Earth's dipoleaxis, positive northward. X is in the plane defined by Z and the linelinking the observation point with the Earth's center. Y is positiveeastward. See http://cdpp.cnes.fr/00428.pdf

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h10201
Term: DM
Definition:

As with the solar magnetic system, the Z-axis of the dipole meridian system (DM) is chosen along the north magnetic dipole axis. However, the Y-axis is chosen to be perpendicular to a radius vector to the point of observation rather than the Sun. The positive Y direction is chosen to be eastwards, so that the X-axis is directed outwards from the dipole. This is a local coordinate system, in that it varies with position, however, since the X-Z plane contains the dipole magnetic field it is quite useful.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h26359