Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51c1828m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51C-1828
Physics
Plasma Physics
[2744] Magnetospheric Physics / Magnetotail, [7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7835] Space Plasma Physics / Magnetic Reconnection, [7836] Space Plasma Physics / Mhd Waves And Instabilities
Scientific paper
We investigate the dynamics of magnetic islands induced by secondary tearing instabilities in collisional magnetic reconnection using a high-resolution resistive MHD simulation. Particularly, a nonlinear simulation of the resistive tearing instability in a high Lundquist number plasma is performed in this study. A large aspect ratio current sheet is nonlinearly developed following the linear growth phase of the initial resistive tearing instability. The secondary tearing instabilities rapidly grow in the current sheet after reaching a critical aspect ratio of the sheet [Biskamp, 1986, Loureiro, et al., 2007]. Typical magnetic islands, i.e., plasmoids, become large while slowly moving to one side. When the plasmoids are saturated, some of those start to move inversely and ejected out of the sheet. Simultaneously, super magnetosonic flows are generated toward the counter direction. We found that, corresponding to the plasmoid motion, reconnection rate on the current sheet adjoining the plasmoid can be drastically enhanced. The physical mechanism of these processes will be discussed at the meeting.
Kusano Kanya
Miyoshi Takahiro
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