[P-EM15] Space Plasma Physics: Theory and Simulation

[PEM15-P03] Comuputer simulation on the structure of double layer in the auroral acceralation region

*Ryouta Ikeba¹, Takayuki Umeda¹, Yoshizumi Miyoshi¹ (1.Institute for Space–Earth Environmental Research, Nagoya University)

Electric fields due to the electric double layers in the auroral acceleration region were first observed in 1970's (Mozer et al. 1977). The FAST observation showed a multi-dimensional structure of the auroral double layer (Ergun et al. 2001). The previous one-dimensional Vlasov simulation of a current-carrying plasma showed that a double layer was driven by a density depression (Newman et al. 2001). However, multi-dimensional kinetic simulations have not been performed yet due to both computational resources and computational techniques. In the present study, we first perform a two-dimensional particle-in-cell simulation of a current-carrying plasma with a density depression to reproduce multi-dimensional structures of electric field in the auroral acceleration region.