Io's sodium cloud - Explanation of the east-west asymmetries

Details Io's sodium cloud - Explanation of the east-west asymmetries Io's sodium cloud - Explanation of the east-west asymmetries

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234.1148s&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 1148-1153.

Astronomy and Astrophysics

Astrophysics

13

Atmospheric Composition, D Lines, Io, Sodium Vapor, Spatial Distribution, Asymmetry, Emission Spectra, Light Scattering, Pressure Effects, Radiation Pressure, Solar Radiation

Scientific paper

An explanation of the east-west asymmetries of Io's sodium clouds is suggested based upon the force experienced by sodium atoms as they resonantly scatter sunlight and upon the ability of this force to alter the cloud atom orbits, as determined by the gravitational fields of Io and Jupiter. Orbit calculations illustrating the time-dependent changes in the sodium atom trajectories produced by the solar radiation force as a function of Io's orbital location are presented in support of this explanation. This theory agrees with the idea that sodium atoms are emitted from the satellite nonisotropically and at a constant rate. These conclusions may be important in studying the global effects of active volcanoes and the intense satellite plasma torus discovered for Io from Voyager I spacecraft measurements.

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