Physics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...38....1p&link_type=abstract
Icarus, vol. 38, Apr. 1979, p. 1-11.
Physics
5
Io, Jupiter (Planet), Planetary Radiation, Sodium Vapor, D Lines, Galilean Satellites, Magnetic Effects, Oxygen Spectra, Planetary Magnetic Fields, Spectrum Analysis, Jupiter, Clouds, Sodium, Io, Emissions, Satellites, D-Lines, Orbits, Radiation, Spectrum, Absorption, Transport, Ejection, Distance
Scientific paper
Observations of emission from sodium presumed to have been ejected from Io in the orbital plane of the Gallilean satellites and extending outward to at least 35 Jupiter radii are reported. Spectra of the sodium D line were observed to have an intensity of 20 to 30 R. Mechanisms for the escape of sodium from Io after sputtering from the surface are: (1) ejection from Io at velocities greater than Jupiter escape velocity, (2) ejection at velocities corresponding to orbits with apoapses of 35 Jupiter radii, and (3) ionization followed by magnetic field sweeping and recombination. The relative contributions of each mechanism are estimated and used to predict the sodium emission intensity at 35 Jupiter radii to be 7 to 8 R, a value considered to be in reasonable agreement with observations. Observations of emission line width and the correlation of intensity with the orbital phase of Io would provide further means of evaluating the proposed mechanisms of sodium ejection.
Pilcher Carl B.
Schempp William V.
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