Plasma flow and critical velocity ionization in cometary comae

Details Plasma flow and critical velocity ionization in cometary comae Plasma flow and critical velocity ionization in cometary comae

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..255h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, March 1986, p. 255-258.

Other

17

Comet Heads, Critical Velocity, Gas Ionization, Magnetohydrodynamic Flow, Space Plasmas, Flow Velocity, Ion Density (Concentration), Ionic Collisions, Plasma Density, Comets, Giacobini-Zinner, Ice Mission, Spacecraft Observations, Plasma, Flow, Velocity, Ionization, Comae, Magnetic Effects, Drag, Mass Loading, Ions, Electrons, Boundaries, Density, Diagrams, Calculations

Scientific paper

A simple relation resulting from the balance of magnetic stresses and drag forces primarily due to ion mass loading is used to characterize the plasma flow in the cometary coma and to infer the ionization rate due to the critical velocity effect. The upper and lower limits between which the effect dominates over photoionization are evaluated. The critical velocity ionization stabilizes the plasma flow speed at nearly 20 km/sec. The contact surface is found to be primarily determined by ion-neutral collisions. Numerical values for the radial profile of the rate of ionization and of the critical boundaries (other than the bow shock) are given.

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