Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5533c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5533-5538. Research supported by the University of Ca
Physics
6
Cometary Atmospheres, Gas Ionization, Plasma Interactions, Solar Wind, Interplanetary Magnetic Fields, Plasma Clouds, Plasma Density, Comets, Laboratory Studies, Simulations, Ionization, Gases, Velocity, Neutral Particles, Solar Wind, Magnetic Fields, Parameters, Experiments, Equipment, Procedure, Diagrams, Theoretical Studies, Maps, Calculations
Scientific paper
The laboratory simulation of the interaction of the solar wind with a comet is used to study the cometary neural gas ionization. The experiment is carried out in the UCR T-1 facility with an ice ball as the comet model. Photographs and data are taken with a variety of values of the solar wind velocity, interplanetary magnetic field (IMF), and comet configurations. The results show that the cometary neutral gas ionization depends on both the velocity of the solar wind and the interplanetary magnetic field. The plasma cloud surrounding the comet is visible only when the solar wind velocity and IMF are both above certain minimum values. This velocity dependent phenomena is explained by Alfven's critical ionization velocity effect. The critical magnetic field may be explained by assuming two stream lower hybrid instability as a triggering mechanism for the ionization of the neutral gas by plasma flow. Critical upper and lower limits for the magnetic field, required by anomalous ionization, are also derived that satisfy the experimental observations.
Chang Tin-Fung
Rahman Hafiz Ur
White Steven R.
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