Dayside Magnetic Reconnection under the Conditions of Dipole Tilt and Northward IMF

Details Dayside Magnetic Reconnection under the Conditions of Dipole Tilt and Northward IMF Dayside Magnetic Reconnection under the Conditions of Dipole Tilt and Northward IMF

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31d0666p&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31D-0666

Physics

2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We have performed a high-resolution and time-dependent three-dimensional MHD simulation of interaction between the solar wind and the Earth's magnetosphere in order to study dayside magnetic reconnection when the dipole tilt and northward IMF are simultaneously included in the whole volume of the simulation box. In the present study, for the case of positive dipole tilt, three different characteristics of the reconnection region appear at the dayside magnetopause during the northward IMF conditions; 0° ≤ θ ≤ 60°, 60° ≤ θ ≤ 120° and 120° ≤ θ ≤ 180°, where θ is a counterclockwise angle in a view from the sun starting from the Y-axis. In the northern and southern hemispheres, both the electric field in the perpendicular direction to convection and the resistive electric field are largest in the region where we would expect occurrence of antiparallel reconnection. Moreover the electric field in the northern hemisphere is almost 3 times larger than that in the southern hemisphere for 45°. However the parallel component of the current in the southern hemisphere is larger than that in the northern hemisphere when the dipole tilt is positive. The feature is different from that for southward IMF condition [Park et al., 2006]. In addition, the perpendicular vorticity has large value in the reconnection regions.

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