Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..293j&link_type=abstract
Geophysical Research Letters, vol. 3, June 1976, p. 293-296.
Astronomy and Astrophysics
Astronomy
11
Astronomical Models, Atmospheric Pressure, Io, Ionospheric Electron Density, Jupiter Atmosphere, Planetary Ionospheres, Thermal Plasmas, Atmospheric Ionization, Earth Magnetosphere, Electron Density Profiles, Electron Impact, Pioneer 10 Space Probe, Planetary Atmospheres, Plasma Diagnostics
Scientific paper
The paper studies charge particle impact as a mechanism for the production of Io's ionosphere. Pioneer 10 thermal plasma measurements and magnetospheric plasma models which explain the observed spatial distribution of neutral hydrogen and sodium atoms in the vicinity of Jupiter's satellite Io imply electron fluxes of about 10 to the 10th/sq cm/s. The fluxes and the temperature (about 100 eV) of this plasma suggest that electron impact ionization is the dominant process in forming the ionosphere of Io. It is found that the surface number density of the neutral species required to match the observed electron density profiles is about 10 to the 9th/cu cm or less. This value is two orders of magnitude lower than previous estimates.
Carlson Richard W.
Johnson Torrence V.
Matson Dennis L.
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