Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44a1713s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH44A-1713
Other
2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail
Scientific paper
To understand large-scale development of magnetic reconnection, it is necessary to consider reconnection triggered at multiple X-points in a long current sheet and associated coalescence of magnetic islands. While a number of numerical simulations have been performed to study multiple X-point magnetic reconnection, most of these simulations are done in periodic systems, in which the large-scale development of magnetic reconnection tends to be disturbed at the boundary. Thus, in this study, we perform two-fluid simulations of multiple X-point magnetic reconnection using an open boundary condition. Here the X-points, which are located with a spatial interval of 12.8D, are initially imposed by adding magnetic perturbations. First, when the initial perturbations having the same amplitude are added at three X-points, the two X-lines at the ends preferentially survive and the middle X-line is vanished by a pair of converging flows from the both ends. Then the two X-lines at the ends retreat from each other. Next, when we enhance the amplitude of initial perturbation at one of the ends by a factor of 1.2 or more, only the enhanced X-line can survive and two other X-lines disappeared. When the X-line at one of the ends is enhanced by a factor of 1.1, however, X-lines at both ends survive and retreat from each other. We have confirmed that such coexistence of both X-lines at the ends takes place at larger amplitude difference as the distance between the end-X-lines are increased. Furthermore, we have also confirmed that when the amplitude of the initial perturbation at the middle X-point is enhanced, the coexistence of two end X-lines occur more easily. These results suggest that more than one X-line can coexist even in the final stage of the development of magnetic reconnection driven in a long current sheet. In addition, we have found more varieties to be introduced to the final stage when the open boundary on one of the sides is changed to a closed boundary. In our presentation, these new simulation results will be shown.
Fujimoto Minoru
Nakamura Takashi
Sekiya Hiroyuki
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