Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11b0806t&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM11B-0806
Physics
7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies
Scientific paper
The leading part of a reconnection jet is known to be unstable to an interchange instability as the jet interacts with the standing plasma ahead of it. We have conducted three-dimensional MHD and Hall-MHD simulations and have clarified the nature of this instability. From MHD simulation results, we have found the driving mechanism of the instability to be essentially the same as the Richtmyer-Meshkov instability that grows at colliding fluid interfaces producing mushroom-like pattern of the magnetic normal component on the current sheet plane. By comparing a number of single-mode runs, the growth speeds of the mushrooms are compared and we find the shorter wavelength mode to grow faster. While the driving mechanism seems to stay the same, Hall-MHD simulation results show more complicated structures and development to turbulence-like state is observed even when starting from a single mode initial disturbance. We have also found the fastest growing wavelength to show quite a peculiar feature in Hall-MHD: Shorter wavelenght is preferred as the thickness of the current sheet is increased.
Fujimoto Minoru
Nakamura Maho
Tandokoro Ryoji
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