Observations of extreme ultraviolet emissions from the Saturnian plasmasphere

Details Observations of extreme ultraviolet emissions from the Saturnian plasmasphere Observations of extreme ultraviolet emissions from the Saturnian plasmasphere

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.5853w&link_type=abstract

Journal of Geophysical Research, vol. 85, Nov. 1, 1980, p. 5853-5856.

Physics

Atmospheric Radiation, Far Ultraviolet Radiation, Plasmasphere, Saturn Atmosphere, Angular Distribution, Energy Dissipation, Oxygen Ions, Toroidal Plasmas, Saturn, Observations, Ultraviolet, Wavelengths, Emissions, Plasmasphere, Photometry, Brightness, Energy, Ions, Plasmas, Toruses, Sputtering, Ice, Source Medium, Satellites, Tethys, Dione, Data, Analysis, Hypotheses

Scientific paper

Emission signals from the Saturnian plasmasphere at wavelengths shortward of 800 A have been detected by the Pioneer ultraviolet photometer. The surface brightness of the emissions is about 0.3 + or - 0.2 R. These short-wavelength emissions are interpreted as arising primarily from the radiative decay of electron-excited atomic oxygen ions (O(2+)), in the region between 5 and 7 Saturn radii from Saturn. The total power radiated by the Saturnian plasma inferred from these ultraviolet measurements is about 2 x 10 to the 16th erg/sec, consistent with in situ plasma measurements. From the observed energy loss rate it is estimated that the ions are introduced into the plasma torus at a rate of 8 x 10 to the 25th ions/sec, possibly through the sputtering of water ice on the surface of Tethys and Dione by particle impact.

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