Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8217007f&link_type=abstract
Unknown
Physics
Cometary Atmospheres, Critical Velocity, Halley'S Comet, Ionization, Kohoutek Comet, Plasmas (Physics), Solar Wind, Magnetic Fields, Magnetohydrodynamic Flow, Magnetohydrodynamic Stability, Plasma Jets, Plasma Waves, Townsend Discharge
Scientific paper
The critical velocity required to trigger the anomalous ionization of a neutral gas by plasma flow is theoretically calculated for a model based on lower hybrid instability. It depends strongly on the plasma and gas parameters, defining the instability development of the ionized atoms beam in the counter-streaming plasma. In particular, the possible role of a critical ionization mechanism for Halley's comet is examined. The fulfillment of both the Townsand condition for the self-sustained beam plasma discharge and the Alfven condition for the critical velocity mechanism indicates that this mechanism may work only within 10,000 km from the cometary nucleus and gives the ion production rate close to that observed for the Kohoutek comet.
Formisano Vittorio
Galeev A. A.
Sagdeev Roal'd. Z.
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