Physics – Plasma Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42b08c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM42B-08
Physics
Plasma Physics
2724 Magnetopause, Cusp, And Boundary Layers, 7800 Space Plasma Physics, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies
Scientific paper
Tearing-mode instability may occur in various regions of space environment; for example, observational evidence has shown that the magnetopause current is often imbedded with a series of magnetic islands (Hau and Sonnerup, 1999). In this study, the tearing-mode instability of a tangential-discontinuity current layer is examined within the framework of two-dimensional, numerical, linear MHD model with anisotropic pressure which is the characteristic of space plasma as shown by the satellite data. The energy equations used to close the MHD model are the double-polytropic laws with two polytropic exponents, γ ∥ and γ perpendicular to , which for γ ∥ = 3, γ perpendicular to = 2 become the CGL laws and for γ ∥ = 1, γ perpendicular to = 1 describe the isothermal state (Hau et al., 1993). It is shown that the dependence of the linear growth rate on pperpendicular to /p∥ and γ ∥ , γ perpendicular to is consistent with the mirror instability criterion based on the double-polytropic MHD model (Hau and Sonnerup, 1993); in particular, the growth rate is larger for smaller values of γ ∥ and γ perpendicular to . For sufficiently large pperpendicular to /pallel$ greater than 1, the tearing perturbations no longer grow exponentially but contains oscillatory modes with the growth rate being greatly enhanced.
Chiou Steven
Hau L.
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