Strong guide field effect on three-dimensional quick magnetic reconnection triggering

Details Strong guide field effect on three-dimensional quick magnetic reconnection triggering Strong guide field effect on three-dimensional quick magnetic reconnection triggering

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53b0419t&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM53B-0419

Physics

7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 7871 Waves And Instabilities, 2744 Magnetotail, 2772 Plasma Waves And Instabilities

Scientific paper

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.

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