Commun. Comput. Phys.,
Two-Fluid Formulation of Lower-Hybrid Drift Instabilities in Current-Sheet Equilibrium with a Guide Field
W. Zhang 1*, Z. Lin 1, P. H. Yoon 2, X. Wang 31 Department of Physics and Astronomy, UC Irvine, Irvine, CA 92697, USA.
2 Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742-2431, USA.
3 Department of Physics, Auburn University, Alabama 36849, USA.
Received 30 November 2007; Accepted (in revised version) 6 March 2008
Available online 21 April 2008
A nonlocal two-fluid formulation has been constructed for describing lower-hybrid drift instabilities in current-sheet configuration with a finite guide magnetic field in the context of magnetic reconnection. As a benchmark and verification, a class of unstable modes with multiple eigenstates are found by numerical solutions with guide field turned off. It is found that the most unstable modes are the electrostatic, short-wavelength perturbations in the lower-hybrid frequency range, with wave functions localized at the edge of the current sheet where the density gradient reaches its maximum. It is also found that there exist electrostatic modes located near the center of the current sheet where the current density is maximum. These modes are low-frequency, long-wavelength perturbations. Attempts will be made to compare the current results with those from kinetic theory in the near future since the validity of the fluid theory ultimately needs to be checked with the more fundamental kinetic theory.
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PACS: 52.35.Vd, 94.30.cp, 52.35.Kt
Key words: Lower-hybrid drift instability, guide field, two-fluid model, Harris equilibrium.
Email: email@example.com (W. Zhang), firstname.lastname@example.org (Z. Lin), yoonp@ ipst.umd.edu (P. H. Yoon), email@example.com (X. Wang)