Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212171s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12171-12179.
Physics
20
Anisotropy, Magnetohydrodynamic Waves, Magnetospheric Instability, Tearing Modes (Plasmas), Collisionless Plasmas, Magnetic Fields
Scientific paper
The stability of a current sheet with a pressure anisotopy is studied using a linear compressible MHD code. In the current sheet, unstable wave modes with a much larger growth rate than that of the isotropic tearing mode can develop. When the pressure anisotropy is small, the unstable modes are basically tearing modes, except that the growth rates are enhanced. When the pressure anisotropy is large, the mode structure is considerably changed. A new oscillating tearing mode is observed for the case of a small wavenumber; this mode is a superposition of two oppositely propagating modes. For the case of a large wavenumber, the eigenmode structure becomes a combination of tearing and mirror modes. It is also found that a large y component of the magnetic field can cancel the effect of pressure anisotropy, leaving the tearing mode unaffected both in growth rate and eigenfunction.
Fu Z. F.
Lee Clarence L.
Shi Yaoming
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