1. Particle Acceleration by Relativistic Expansion of Magnetic Arcades
H. Takahashi, E. Asano, R. Matsumoto
Chiba Unv. Japan
shock
current sheet
Asano et al. (P12)

2. Simulation Model of Particle Accelerations
2-dim. Paritcle-In-Cell (PIC) simulation
Mikic Model extended into relativistic plasma
(NX,NY)=(200,1600)
Assumption
elecron-positron plasma
collisionless
Plasma density is slightly
larger than Goldreich-Julian density
Initial Model constructed by Mikic(‘88)
Bz : toroidal components
Bx,By: poloidal components

3. 2.5-dimensional PIC Simulation: Result
Tg=90.0
Tg=237.5
color: Bz
line: field line
color: density
line: field line
color: Bz
line: field line
ExB drift motion leads to charge
deficiency in the arcades.
Magnetic reconnections take place
inside the expanding arcades.