Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42c..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM42C-03
Physics
7835 Magnetic Reconnection, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies
Scientific paper
Nonlinear dynamics of cross-tail current instabilities (modes with wavenumber vectors parallel to the current sheet) are studied by 2D PIC code simulations. For an ion-scale current sheet initially carried dominantly by ions, we found that the Kelvin-Helmholtz instability destabilized by the velocity shear between the lobe and the current-carrying ions comes to dominate after a few tens of the ion-gyration periods. The non-linear evolution of the Kelvin-Helmholtz instability warps the plasma sheet significantly and excites lower hybrid drift waves at its edge. Rapid magnetic field dissipation is observed associated with the non-linear coupling between these two instabilities. We show that the non-linear coupling between these two instabilities is responsible for the observed rapid dissipation. The simulation result presents a new route for magnetic field dissipation in an ion-scale current sheet.
Fujimoto Minoru
Hayashi Daisuke
Shinohara Iku
Suzuki Hiroshi
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