Influences of sub-Alfvénic shear flow on nonlinear evolution of magnetic reconnection

Details Influences of sub-Alfvénic shear flow on nonlinear evolution of magnetic reconnection Influences of sub-Alfvénic shear flow on nonlinear evolution of magnetic reconnection

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51c1823m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51C-1823

Physics

Plasma Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena

Scientific paper

Influences of sub-Alfvénic shear flow on dynamics processes of magnetic reconnection are studied in the framework of compressible MHD and Hall MHD. In the absence of the shear flow, maximum reconnection rate increases with decreasing a plasma beta. It is found that the sub-Alfvénic shear flow can either suppress or accelerate the magnetic reconnection, which is mainly determined by the thickness of the shear flow. The shear flow shows a boosting effect on the magnetic reconnection when the thickness of the shear flow exceeds a threshold in the high beta plasma. In the low beta plasma, the shear flow exhibits a solely suppressing effect on the magnetic reconnection and the boosting effect nearly disappears. A pair of slow shocks, formed in the upper and lower inflow region, blocks the plasma flow entering into the reconnection region, which may lead to the disappearance of the boosting effect. With including a Hall effect, the shear flow also shows a boosting and suppressing effect on the magnetic reconnection. However the boosting effect becomes weaker with increasing the ion inertial length.

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