HR: 1340h
AN: SM53B-0421    [Abstracts]
TI: Reproducing the bi-polar magnetic signature at the jet leading edge by 3-D reconnection with non-zero guide field
AU: * Shirataka, N
EM: norikos@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, TK 152-8551 Japan
AU: Tandokoro, R
EM: rtdotoro@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, TK 152-8551 Japan
AU: Fujimoto, M
EM: fujimoto@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, TK 152-8551 Japan
AB: A bi-polar (southward-then-northward) signature of Bz component at the leading edge of earthward jets in the magnetotail has been reported [Slavin et al. 2003]. Here we try to reproduce this magnetic field feature by three-dimensional reconnection (finite extent in the dawn-dusk direction) in the presence of non-zero guide field (dawn-dusk magnetic component). Setting the guide field intensity by referring to Slavin et al. and setting the dawn-dusk extent of the reconnection region to an often quoted value [Angelopoulos et al., 1997], we managed to reproduce the bi-polar signatures by a 3-D (Hall) MHD simulation with anomalous resistivity. Redirecting the argument, the bi-polar signature may be taken as the evidence that the dawn-dusk width of the reconnection region is less than several Earth radii.
DE: 7800 SPACE PLASMA PHYSICS
DE: 7823 Ionization processes
DE: 7835 Magnetic reconnection
DE: 7839 Nonlinear phenomena
DE: 7843 Numerical simulation studies
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting