Dependency of the polar cap phenomena and magnetospheric dynamics on the intrinsic magnetic field

Details Dependency of the polar cap phenomena and magnetospheric dynamics on the intrinsic magnetic field Dependency of the polar cap phenomena and magnetospheric dynamics on the intrinsic magnetic field

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1714o&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1714

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2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2776 Polar Cap Phenomena

Scientific paper

It is well known that the polar cap phenomena and magnetospheric dynamics in the earth"fs magnetosphere are generally controlled by the solar wind and IMF (interplanetary magnetic field) through magnetic reconnection. The cross polar cap potential has a tendency to be saturated under a strong IMF, however it has a different tendency to increase of the solar wind speed. Potential saturation only occurs with the increasing magnitude of southward IMF, however does not with the increasing velocity of the solar wind. On the contrary, how do the polar cap and magnetosphere behave when the magnitude of an intrinsic magnetic field of earth changes? The relationship is not simple because the sizes of magnetosphere and polar cap, magnetic reconnection and induced convection in the magnetosphere and ionosphere are complicatedly involved. We have studied the dependency of the polar cap phenomena and magnetospheric dynamics on the intrinsic magnetic field by using a 3D global MHD simulation of interaction between the solar wind and earth"fs magnetosphere. When the magnitude of intrinsic magnetic field, for example, decreases, the size of magnetosphere decreases, on the other hand the size of polar cap expands. Moreover the polar phenomena also depends on the orientation and magnitude of IMF. We will present the relationship from simulation results.

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