Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1444l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1444
Physics
2723 Magnetic Reconnection (7526, 7835), 7526 Magnetic Reconnection (2723, 7835), 7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
Three-dimensional patchy magnetic reconnections are studied by means of a MHD simulation and an ion- electron two-fluid simulation. For patchy reconnections, the initial reconnection sites are X-segments instead of X-lines. Our simulation results indicate that the tension force of the reconnected magnetic field line can remove plasma from the reconnection site to create a low-pressure center near the initial reconnected region. The low-pressure center can attract plasma and pull the magnetic field lines into the reconnected region from all directions, except the directions aligned to the reconnection components. As a result, the strength of the magnetic field around the reconnected flux tube is enhanced, but the size of the localized reconnection site shrinks. For reconnections without background guide field, the magnetic field lines around the localized reconnection site are bent toward the reconnection site. This is in contrast to the 2-D Hall MHD simulation results, in which the magnetic field lines near the reconnection site always bend toward one direction, which is anti-parallel to the background electric current. Our simulation results also show that the multiple patchy reconnections can drive plasma circulation between two near-by reconnection sites to form eddies inside the current layer. Only the outermost reconnection site can eject fast plasma flow away from the eddy region. The Kelvin-Helmholtz instability and nonlinear Mach cone waves generated by the localized fast plasma flow are examined. Possible aurora activities associated with the patchy magnetic reconnections in the distant tail and the Mach cone waves along the localized fast flow boundaries will be discussed.
Lai Stan
Lyu L.
Tsai Tun Tao
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