Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm22b..06d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM22B-06
Physics
Plasma Physics
[2723] Magnetospheric Physics / Magnetic Reconnection, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2753] Magnetospheric Physics / Numerical Modeling, [7833] Space Plasma Physics / Mathematical And Numerical Techniques
Scientific paper
We use resistive MHD and Hall MHD simulations to investigate the global and local properties of dayside magnetopause reconnection in the presence of a guide field. Using a newly developed GPU accelerated Hall MHD code, we confirm previous two-dimensional asymmetric reconnection scaling results. However, three-dimensional global MHD simulations differ in important ways from the local two-dimensional results. Specifically, the relative positions of the X line, the stagnation point and the current sheet in the global simulations are not as predicted by the two-dimensional theory. This discrepancy is a consequence of global constraints (viz., the magnetic topology of the magnetopause, global force balance, and the global geometry of the Chapman-Ferraro current sheet) that are not present in the local two-dimensional system. Further, the three-dimensional nature of the stagnation point flow modifies the predicted two-dimensional scaling of reconnection rate with plasma resistivity.
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