[PEM11-P01] Effects of Inclination/Rotation of Earth’s Magnetic Axis on Magnetosphere Simulated by Global MHD Model
Keywords:M-I Coupling, Global MHD Simulation, Ionospheric Effect
On the other hand, in the development/improvement of the global MHD model in NICT, which was originally developed by Tanaka  and Tanaka et al. , introducing the inclination and rotation of Earth’s magnetic axis with respect to the rotation axis has been remained as one of the most difficult problems. In other words, in the present model, the precession between the magnetic axis and the rotation axis is not included. This means that the simulated magnetosphere will show a different structure and temporal development than the actual magnetosphere.
We, for the first time, equivalently introduce the precession by rotating the background conductance distribution due to solar illumination (i.e., depending on the geographic coordinate) with respect to the geomagnetic coordinate. (Improvement of the conductance setting in the auroral region is the next challenge.) In this paper, we will show how the simulated magnetosphere is changed by this improvement, focusing on the near-Earth plasma environment.