Numerical simulation of nonoscillatory mirror waves at the earth's magnetosheath

Details Numerical simulation of nonoscillatory mirror waves at the earth's magnetosheath Numerical simulation of nonoscillatory mirror waves at the earth's magnetosheath

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..101p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Jan. 1, 1986, p. 101-112.

Physics

105

Earth Magnetosphere, Magnetohydrodynamic Stability, Magnetosheath, Plasma Waves, Wave Generation, Beta Factor, Hydrogen Plasma, Lines Of Force, Mathematical Models, Nonoscillatory Action, Positive Ions

Scientific paper

The generation of nonoscillatory mirror waves is studied using a one-dimensional periodic hybrid electromagnetic simulation. The ion dynamics are treated exactly; the electrons are approximated as a finite pressure, massless fluid. Compression of the flux tubes in the magnetosheath causes a large pressure anisotropy, and it has been proposed that this anisotropy drives a mirror instability. The mirror waves have been identified by large amplitude fluctuations of the magnetic field, anticorrelated with pressure fluctuations. The simulations are initiated in a homogeneous high beta (beta = 2.5) plasma with the ambient magnetic field at various angles to the simulation axis. It is found that ion cyclotron waves are also driven by the pressure anisotropy, in competition with the nonoscillatory mirror waves. Simulations indicate that in a pure H-1(+) plasma the much faster growing ion cyclotron waves absorb the free energy in the anisotropy to the extent that mirror waves should not be observed. Analysis of the dispersion relations of mirror waves and ion cyclotron waves in the multicomponent plasma indicates that He-4(2+) and O-16(6+) ions in the solar wind should stabilize the ion cyclotron waves sufficiently that the mirror waves become the dominant instability.

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