HR: 1340h
AN: SM53B-0419    [Abstracts]
TI: Strong guide field effect on three-dimensional quick magnetic reconnection triggering
AU: Tanaka, K G
EM: tkentaro@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Oookayama Meguro, Tokyo, 152-8551 Japan
AU: Shinohara, I
EM: iku@stp.isas.jaxa.jp
AF: Institute of Space and Astronautical Science, Japan Aerospace Explorarion Agency, 3-1-1 Yoshinodai Sagamihara, Kanagawa, 229-8510 Japan
AU: * Fujimoto, M
EM: fujimoto@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Oookayama Meguro, Tokyo, 152-8551 Japan
AB: Influence of the guide field on quick magnetic reconnection triggering (QMRT) is investigated by three-dimensional (3-D) full-particle simulations with the mass ratio of Mi/Me = 400. A systematic survey of the QMRT has been made for two initial guide fields of B0y/B0x = 0.75, 1.3 (B0x: asymptotic magnitude of the reconnecting component). QMRT has been found in a null guide-field case of D=0.5 (D: the current sheet half thickness normalized by the ion inertial length) and is quick because reconnection onset is directly coupled to the quickly growing lower-hybrid drift instability (LHDI) [Shinohara et al., 2004]. This work has revealed that the thickness of D = 0.5 with B0y = 0.75 shows no QMRT signature such as current density intensification or significant reconnected magnetic field at the neutral sheet, and crucially required thickness to reach QMRT has been shown at most D = 0.35. For B0y = 1.3, thickness of D = 0.35 turns to be too thick to achieve QMRT, and required thickness to reach QMRT appears for D < 0.3. This work has shown one of the difficulties in the QMRT in the presence of a strong guide field.
DE: 7835 Magnetic reconnection
DE: 7843 Numerical simulation studies
DE: 7871 Waves and instabilities
DE: 2744 Magnetotail
DE: 2772 Plasma waves and instabilities
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting