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Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243.1088h&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 1088-1102.
Other
37
Atmospheric Models, Comet Heads, Earth Ionosphere, Ionospheres, Plasma Interactions, Solar Wind, Adiabatic Conditions, Comet Nuclei, Comet Tails, High Energy Electrons, Isothermal Processes, Neutral Particles, Photoionization, Plasmapause, Shock Waves, Solar Protons, Comets, Ionosphere, Oscillations, Solar Wind, Dynamics, Pressure, Mathematical Models, Atmosphere, Velocity, Ionization, Data, Diagrams, Photographs, Size, Nucleus, Energy, Time Dependency, Ions, Shape, Shock, Ionopause, Radius
Scientific paper
Representing the cometary ionosphere by a single fluid model characterized by an average ionization time scale, both the ionosphere's development as a comet approaches the sun and its response to sudden changes in solar wind conditions are investigated. Three different nuclear sizes (small, average, very large) and three different modes of energy addition to the atmosphere (adiabatic, isothermal, suprathermal) are considered. It is found that the crucial parameter determining both the nature and the size of the ionosphere is the average ionization time scale within the ionosphere. Two different scales are identified. It is noted that the ionosphere can also be characterized by the relative sizes of three different scale lengths: the neutral standoff distance from the nucleus, the ion standoff distance from the nucleus, and the nuclear distance at which the ions and the neutrals decouple collisionally.
Houpis Harry L. F.
Mendis Asoka D.
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