Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1730m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1730
Other
7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)
Scientific paper
Magnetic reconnection is a key process of various bursty phenomena in space plasmas. In general, a magnetic Reynolds number of the space plasma is extremely high. Therefore, since magnetic reconnection rate becomes low as magnetic Reynolds number increases within the framework of the stationary resistive MHD model, kinetic effects have been considered to realize realistic fast magnetic reconnection in modern reconnection models. However, it is thought that the MHD description is valid within a very wide scale range since a scale gap between macro and micro is so large, e.g., in the solar corona, the ratio of macro to micro will be more than 107. In this situation, how an ion-scale thin current sheet can be realized from a macro scale magnetic structure? Conversely, how the microscopic processes can affect macroscopic MHD dynamics? From the analogy of hydrodynamics, we expect that the strong MHD turbulence will be developed in the wide range. Thus, in this case, fast magnetic reconnection might be driven by the turbulence other than the kinetic effects. In this study, a very high-resolution resistive MHD simulation is performed to clarify multi-scale dynamics of the resistive tearing instability at high magnetic Reynolds number. Results show that small scale plasmoids, which seem to have an internal structure by itself, are intermittently created and ejected by the secondary tearing instability. Moreover, it seems that fast magnetic reconnection is achieved by intermittent dynamics of the plasmoids. This might support that the MHD turbulence is essential for fast magnetic reconnection at very high magnetic Reynolds number.
Becchaku M.
Kusano Kanya
Miyoshi Takahiro
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