Comparison of High Lundquist Number Scaling of Dayside Magnetospheric Reconnection in BATSRUS and OpenGGCM with the Hall term

Details Comparison of High Lundquist Number Scaling of Dayside Magnetospheric Reconnection in BATSRUS and OpenGGCM with the Hall term Comparison of High Lundquist Number Scaling of Dayside Magnetospheric Reconnection in BATSRUS and OpenGGCM with the Hall term

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33e..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33E-07

Physics

Plasma Physics

[7835] Space Plasma Physics / Magnetic Reconnection, [7899] Space Plasma Physics / General Or Miscellaneous, [7959] Space Weather / Models, [7999] Space Weather / General Or Miscellaneous

Scientific paper

Global modeling of the Earth's magnetosphere typically uses anomalous or grid scale numerical resistivity in order to achieve fast reconnection with localized reconnection sites. Here a different approach is taken. This study investigates scaling of dayside magnetopause reconnection under idealized conditions in the BATSRUS and OpenGGCM models with constant uniform resistivity, so that a global Lundquist number can be defined. Lundquist number is varied from on the order of 104 to 105 with localized resolution as high as 1/32 Re. Larger numbers of plasmoids, or flux transfer events occur at higher Lundquist numbers. However, over some range of resistivities, classical, 2D Sweet-Parker scaling applies surprisingly well to the three dimensional current sheets in the models. For the first time, we also present a comparison of resistive and Hall MHD simulations of magnetospheric reconnection.

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