Nonlinear stability of the dayside cometary ionopause

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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.

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