Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..967e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 967-973.
Astronomy and Astrophysics
Astrophysics
7
Cometary Atmospheres, Giacobini-Zinner Comet, Halley'S Comet, Ionopause, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Taylor Instability, Comet Nuclei, Interplanetary Magnetic Fields, Planetary Ionospheres, Solar Wind, Subsonic Flow, Comets, Ionopause, Stability, Dayside, Magnetohydrodynamics, Waves, Perturbations, Hypotheses, Amplitude, Halley, Giacobini-Zinner, Models, Wavelengths, Boundaries, Calculations, Growth Rate
Scientific paper
Previously, the authors showed that the cometary ionopause would be subject to both Kelvin-Helmholtz and Rayleigh-Taylor type instabilities. This conclusion, based on linear MHD theory, applies only to infinitesimal wave amplitude perturbations. The present nonlinear study permits a description of the ionopause stability in terms of the finite perturbation amplitude of both Kelvin-Helmholtz and Rayleigh-Taylor modes. It examines the evolution of the unstable modes and determines under what conditions finite amplitude effects are expected to stabilize a growing wave disturbance. The present nonlinear analysis is applied to the ionopause at Comet Halley and Comet Giacobini-Zinner.
Ershkovich A. I.
Flammer K. R.
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