Other
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415001p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15001-15009. Research supported by the University of
Other
10
Ion Distribution, Solar Wind, Wave Propagation, Analytic Functions, Approximation, Wave Dispersion
Scientific paper
The destabilization of an otherwise isotropic and homogeneous plasma to the mirror mode due to the presence of newborn ions with a ring-type distribution has been studied. Major differences have been found between mirror waves driven by anisotropic bi-Maxwellian distributions and mirror waves driven by ring-type distributions. Approximate expressions for the growth rates and real frequencies of mirror waves driven by newborn ion distributions are derived in order to provide simple expressions for these quantities and to highlight the differences between usual mirror waves and ring-type distribution driven mirror waves. For pure ring ion distributions, the analytic approximations are quite good. For ring-beam distributions, the mirror waves appear with a real frequency approximately equal to the ring ion Doppler frequency. Mirror waves have been identified in the magnetosheaths of Comets Halley and Giacobini-Zinner based on polarization and on anticorrelated field and density fluctuations. There is good agreement between the wavelength predicted by linear theory and the wavelength observed in the magnetosheath of Comet Halley.
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