Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1033y&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1033-1036. Research supported by NASA.
Physics
5
Giacobini-Zinner Comet, Halley'S Comet, Ion Distribution, Magnetohydrodynamic Stability, Solar Wind, Free Energy, Magnetic Fields, Magnetohydrodynamic Waves, Pitch (Inclination), Comets, Pickup, Ions, Kinetics, Stability, Distribution, Hydromagnetics, Calculations, Alfven Waves, Velocity, Thickness
Scientific paper
The stability of ion shell distribution is an interesting and important issue in view of the fact that it is stable under perturbations propagating parallel to the ambient magnetic field, despite large amount of free energy it contains. It was found, however, that if the shell distribution of ions has a sufficient amount of drift speed with respect to the solar wind hydromagnetic waves, it can become unstable. The obliquely propagating hydromagnetic instability associated with the ion shell distribution was recently discovered. This letter presents the unified stability analysis of the ion shell distribution, under what condition the drift-induced instability of the type first discussed by Gary and Sinha (1989), and the oblique hydromagnetic instability discussed by Wu and Yoon (1990) are excited, and how the two types of instabilities are related.
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