State transition of the magnetosphere-ionosphere compound system due to a northward turn of the interplanetary magnetic field revealed from a global MHD simulation and formation of the overshielding potential

Details State transition of the magnetosphere-ionosphere compound system due to a northward turn of the interplanetary magnetic field revealed from a global MHD simulation and formation of the overshielding potential State transition of the magnetosphere-ionosphere compound system due to a northward turn of the interplanetary magnetic field revealed from a global MHD simulation and formation of the overshielding potential

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13b1800f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13B-1800

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2753] Magnetospheric Physics / Numerical Modeling, [2760] Magnetospheric Physics / Plasma Convection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Using a self-consistent global magnetohydrodynamic (MHD) simulation, we investigate the transient behavior of the magnetosphere-ionosphere compound system during deformation of the magnetosphere after a northward turn of the interplanetary magnetic field (IMF). We find that a peculiar Region 2 field-aligned current (R2 FAC) caused by a transient dynamo is enhanced in the ionosphere and, consequently, the convection field in the ionosphere is overshielded after the northward turn of the IMF. On the other hand, in the magnetosphere, the transient dynamo appears on the lower-latitude side of the dayside cleft. This dynamo is driven by the sunward convection flow that descends the enhanced pressure slope in the cleft region. This sunward flow and the enhanced pressure are caused by the release of magnetic tension accumulated in the southward IMF interval. Simultaneously, a counter-clockwise vortex on a sphere of r=8Re (a clockwise vortex in the equatorial plane) in the afternoon sector appears in the magnetosphere. Consequently, the overshielding potential due to the R2 FAC in the ionosphere is a counterpart of the flow vortex in the magnetosphere. Finally, we note that the effect of the grad-B/curvature drift, which is due to the ring-current particles, may be insignificant because the dynamo responsible for the overshielding appears in the higher-latitude region.

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