Japan Geoscience Union Meeting 2016

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International Session (Poster)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM06] Magnetospheric Multi-Scale (MMS) mission -- A new age of magnetospheric physics

Tue. May 24, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Seiji Zenitani(National Astronomical Observatory of Japan), Naritoshi Kitamura(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Yoshifumi Saito(Solar System Science Division, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Paul Cassak(West Virginia University), Li-Jen Chen(NASA Goddard Space Flight Center), Craig Pollock(NASA Goddard Space Flight Center)

5:15 PM - 6:30 PM

[PEM06-P05] Scaling-law for early-stage development of magnetic reconnection

*Kenya Shimizu1, Masaki Fujimoto2,1, Iku Shinohara2 (1.Graduate School of Science, Tokyo University, 2.Japan Aerospace Exploration Agency/Institute of Space and Astronautical Science)

Keywords:Magnetic Reconnection

A scaling-law for early-stage development of magnetic reconnection has been found from comparing two-dimensional particle simulation results of anti-parallel magnetic reconnection (asymptotic field denoted by B0) with different current sheet thicknesses (D) and different ion-to-electron mass ratios (M). In these runs, magnetic reconnection is initiated by adding non-zero magnetic field normal to the current sheet. When the reconnected flux (in the B0 D unit) at various times is plotted versus re-scaled reconnection electric field Erx D1/2 (Erx in the VA B0 unit, where VA is the relevant Alfven speed) obtained simultaneously, by which procedure a curve is obtained from each run, the curves obtained from the early development phases (reconnected flux < 2) of various runs are found to overlap among themselves. The spatial structures of some quantities around the X-lines determine the reconnection rates. Sampling the spatial profiles obtained when the same amount of magnetic flux is reconnected from different runs, we confirm that the non-dependence on M and the D1/2-scaling of the reconnection rate are consistent with how the spatial scales vary according to M and D.