Sputter ejection of matter from Io

Details Sputter ejection of matter from Io Sputter ejection of matter from Io

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6933h&link_type=abstract

Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6933-6938. Research supported by the California Institute of Technol

Physics

44

Atmospheric Models, Io, Jupiter Atmosphere, Mass Transfer, Particle Collisions, Earth Magnetosphere, Oxygen Ions, Potassium, Sodium, Sulfur, Elements, Volcanism, Trajectories, Jupiter, Satellites, Io, Surface, Ejection, Sputtering, Magnetosphere, Particles, Interactions, Oxygen, Collisions, Flux, Toruses, Atmosphere, Abundance, Sodium, Saltation, Potassium, Sulfur, Mass, Absorption, Energy, Spectrum, Topography, Ions, Protons

Scientific paper

Direct collisional interaction of magnetospheric particles, particularly 520-eV S ions, with Io, cause sputter removal of matter. It is estimated that direct sputtering of a full-disk S-containing atmosphere with an exobase at a few hundred km, can provide up to 5 x 10 to the tenth S atoms per sq cm-s. Supplies of S and O required to stabilize the torus are estimated to be from 10 to the 10th to 10 to the 12th per sq cm-s. Sputtering rates are calculated for an atmosphere containing a one percent concentration of Na and K, and are found to be large enough to supply the fluxes required to maintain the Na and K clouds. Sputtering is found to remove heavy molecules from the atmosphere, and the rate of direct sputtering of unprotected surfaces is calculated for ejections of S and Na. Atomic species on the surface are ejected at a rate proportional to the surface abundance; and plume sputtering, avalanche cascading, and ionic saltation which lead to spatial and temporal variations in the number of ejected particles are observed.

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