Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..708s&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 708-725.
Astronomy and Astrophysics
Astrophysics
16
Io, Molecular Clouds, Radiation Effects, Sodium, Solar Radiation, Asymmetry, D Lines, Data Acquisition, Jupiter (Planet), Light Scattering, Monatomic Molecules, Particle Acceleration, Resonance Scattering, Telescopes, Three Dimensional Models, Jupiter, Satellites, Io, Sodium, Clouds, Asymmetry, Diagrams, Shape, Mathematical Models, Interactions, Solar Radiation, Pressure, Resonance, Scattering, Intensity, Observations, Hypotheses, Oscillations, Data, Plasma Torus, Calculations, Emissions, Velocity, Phase An
Scientific paper
A three- dimensional model for Io's sodium cloud incorporating the full effects of solar radiation acceleration associated with solar resonance scattering of atoms in the D-1 and D-2 lines is developed and applied to interpret two different but related east-west asymmetries exhibited in the cloud, using data obtained from ground-based telescopes. The physical changes produced in the cloud by the solar radiation acceleration as a function of satellite phase angle are documented, and how these changes explain the asymmetries is clarified. The model results suggest an east-west phase lag asymmetry of 10-15 degrees; results for the observed east-west intensity asymmetry of Bergstrahl (1977) are also presented. The east-west shape and intensity asymmetries are found to follow directly from the lack of circular symmetry about Jupiter of the forces acting on the cloud atoms.
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