Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8782e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 1, 1986, p. 8782-8788. Research supported by the Israel Academy
Physics
8
Comets, Compressibility, Interplanetary Magnetic Fields, Ionopause, Kelvin-Helmholtz Instability, Particle Collisions, Cometary Atmospheres, Discontinuity, Equations Of State, Magnetohydrodynamics, Maxwell Equation, Plasmas (Physics), Solar Wind
Scientific paper
The authors have analyzed the stability of a contact surface located at the ram pressure balance position in a comet coma ionosphere in the presence of collisions between ions and neutrals and finite compressibility. They find that if the surface is taken to be a tangential discontinuity which excludes the interplanetary magnetic field from the ionosphere, this ionopause will be violently unstable to MHD modes. The authors therefore expect the large-scale magnetic field to permeate the entire coma, even during periods of quiet solar activity. As a result, a stable cometary ionopause may form at a much greater distance from the nucleus.
Ershkovich A. I.
Eviatar Aharon
Prialnik Dina
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