2nd East-Asia Numerical Astrophysics Meeting, KASI Daejeon KOREA

Particle Acceleration by Relativistic Expansion of

Magnetic ArcadesH. Takahashi, E. Asano, R. Matsumoto

Chiba Unv. Japan

Asano et al. (P12)

shock

current sheet

2nd East-Asia Numerical Astrophysics Meeting, KASI Daejeon KOREA

Simulation Model of Particle Accelerations

2-dim. Paritcle-In-Cell (PIC) simulationMikic Model extended into relativistic plasma(NX,NY)=(200,1600)

Assumptionelecron-positron plasmacollisionlessPlasma density is slightly

larger than Goldreich-Julian density

Bz : toroidal componentsBx,By: poloidal components

Initial Model constructed by Mikic(‘88)

2nd East-Asia Numerical Astrophysics Meeting, KASI Daejeon KOREA

2.5-dimensional PIC Simulation: Result

color: density

line: field line

color: Bz

line: field line

color: Bz

line: field line

Tg=237.5Tg=90.0

ExB drift motion leads to charge deficiency in the arcades.

Magnetic reconnections take place inside the expanding arcades.