A unidimensional model of comet ionosphere structure

Details A unidimensional model of comet ionosphere structure A unidimensional model of comet ionosphere structure

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1759e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1759-1765. Research supported by the U.S. National

Astronomy and Astrophysics

Astronomy

14

Astronomical Models, Cometary Atmospheres, Ionospheres, Plasma Dynamics, Giacobini-Zinner Comet, Halley'S Comet, Photoionization, Solar Neighborhood, Comets, Models, Ionosphere, Structure, Plasma, Comae, Momentum, Density, Flow, Distance, Distribution, Velocity, Parameters, Magnetic Fields, Comparisons, Spacecraft Observations, Giotto Mission, Giacobini-Zinner, Halley, Pressure, Friction, Calculations, Diffusion

Scientific paper

The authors have considered the one-dimensional continuity and momentum equations for the plasma created in the expanding coma of a comet near the Sun. For an inverse square dependence of neutral density they have solved the continuity equation in the presence of radial plasma flow. For distances large compared to the size of the nucleus, the distribution falls off as r-1 with a velocity dependent coefficient which reduces to the photochemical steady state case in the limit of vanishing radial plasma outflow. This density distribution is used in the treatment of the momentum equation from which an analytic expression for the magnetic field configuration is derived in the presence of outflow, photoionization, dissociative recombination, plasma fluid pressure, and friction between the ions and neutrals.

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