HR: 0800h
AN: SM21B-0376    [Abstracts]
TI: Scalings of steady state Hall MHD reconnection in high-β space plasmas
AU: * Wang, X
EM: xgwang@dlut.edu.cn
AF: Dalian University of Technology, Collge of Advanced Science & Technology, Dalian University of Technology, Dalian, 116024 China
AU: Yang, H
EM: hayang@ustc.edu.cn
AF: University of Science and Technology of China, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026 China
AU: Jin, S
EM: spjin@ustc.edu.cn
AF: University of Science and Technology of China, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026 China
AB: Scalings of Hall magnetohydrodynamics (MHD) reconnection in high-β plasmas has been studied in steady states. It again confirms previous temporal evolution reconnection results that while the width of the reconnection layer is scale by ω_A/Ω_ci=d_i/L_c, where ω_A the Alfven frequency, Ω_ci the ion gyrofrequency, L_c the typical system length scale and d_i=c/ω_pi the ion inertial length, the length of the layer should be scaled by (ω_A/Ω_ci)^1/2L_c=(d_iL_c)^1/2 [X. Wang and A. Bhattacharjee, Phys. Rev. Lett. 70, 1627 (1993)], to yield the fast reconnection rate of (d_i/L_c)^1/2V_A with V_A the Alfven velocity [X. Wang et al., Phys. Rev. Lett. 87, 265003 (2001)]. It is also shown that the reconnection rate is proportional to the perturbed boundary flow. Furthermore it is found that in the high-β plasmas, the reconnection rate keeps constant in the regime β<2, and decays as β^-1/2 for β≥q2.
DE: 7835 Magnetic reconnection (2723, 7526)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005