Scalings of steady state Hall MHD reconnection in high-β space plasmas

Details Scalings of steady state Hall MHD reconnection in high-β space plasmas Scalings of steady state Hall MHD reconnection in high-β space plasmas

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21b0376w&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM21B-0376

Physics

7835 Magnetic Reconnection (2723, 7526)

Scientific paper

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/Ωci=d_i/L_c, where ω_A the Alfven frequency, Ωci the ion gyrofrequency, L_c the typical system length scale and d_i=c/ωpi the ion inertial length, the length of the layer should be scaled by (ω_A/Ωci)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.

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