HR: 1340h
AN: SM53B-1291    [Abstracts]
TI: Electron acceleration during magnetic islands coalescence in magnetic reconnection
AU: * Yumura, T
EM: yumu@stp.isas.jaxa.jp
AF: ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
AU: Tanaka, K G
EM: tkentaro@stp.isas.jaxa.jp
AF: ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
AU: Shinohara, I
EM: iku@stp.isas.jaxa.jp
AF: ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
AU: Fujimoto, M
EM: fujimoto@stp.isas.jaxa.jp
AF: ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
AB: Production of energetic electrons is one of the most interesting topics in space plasma physics. Magnetic reconnection has a significant role to produce energetic electrons. In the Earth's magnetosphere, magnetotail reconnection has been thought to be a generation mechanism of the observed energetic electrons. The electron acceleration mechanism during magnetic reconnection has been surveyed by theoretical and observational studies up to today. However, the detailed production mechanism of energetic electron still remains an open question. In this study, we focused magnetic islands coalescence process and carried out two dimensional electromagnetic full particle simulations. In our simulation, multi magnetic islands are given initially in magnetic field. In the result, we found production of energetic electrons corresponded coalescence phase from time evolution of electron energy spectra. These accelerated electrons spatially formed multi ring distribution. Earlier studies had indicated accelerated electrons formed single ring distribution, multi ring distribution was first to be found in our simulations. We also find out magnetic islands coalescence region was electron accelerate region as well as near X-line and pileup region. These results indicate big effect of coalescence on electron acceleration mechanism. In this presentation, we discuss where, when, and how energetic electrons are produced during magnetic islands coalescence.
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 7835 Magnetic reconnection (2723, 7526)
DE: 7845 Particle acceleration
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting