Numerical modeling of near-comet shock waves - Some structural features and the mechanisms of energy dissipation

Statistics – Computation

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Astronomical Models, Cometary Atmospheres, Energy Dissipation, Plasma-Electromagnetic Interaction, Shock Waves, Wave Fronts, Algorithms, Computational Astrophysics, Ionic Mobility, Solar Wind

Scientific paper

A numerical model of the structure of a cometary shock wave is described. It is shown that the main contribution to energy dissipation at the shock wave front comes from cometary ions which are produced by the ionizing effect of the solar wind on the cometary atmosphere. A portion of the ions move ahead of the wavefront due to their high cyclotron rotation velocity; and additional acceleration occurs in the electric field of the solar wind. It is found that the energy dissipated by the accelerating ions is not sufficient to prevent the development of a resistive compression discontinuity in the shock wave front. The dimensions of the compression discontinuity are of the order of the Larmor radius of the cometary ions.

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