Discovery of an Io-correlated energy source for Io's hot plasma torus

Details Discovery of an Io-correlated energy source for Io's hot plasma torus Discovery of an Io-correlated energy source for Io's hot plasma torus

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2231s&link_type=abstract

Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2231-2240.

Astronomy and Astrophysics

Astronomy

26

Energy Sources, High Temperature Plasmas, Io, Satellite Atmospheres, Toroidal Plasmas, Astronomical Spectroscopy, Brightness Distribution, Energy Transfer, Space Plasmas, Voyager Project, Jupiter, Satellites, Io, Plasma, Torus, Energy, Source, Brightness, Voyager, Ultraviolet Spectrometer, Emissions, Electrons, Temperature, Spectra, Composition, Density, Cooling, Power, Geometry, Parameters, Data, Flow, Models, Distribution, Position (Location), Azimuth

Scientific paper

Energy flowing into Io's hot plasma torus from a local-time correlated source and from an Io-related source are discussed, and a correlation of the brightness of the ansae of the torus with the apparent orbital phase of Io is reported. It is shown that the energy flows cause an azimuthal modulation of the brightness of the torus that is correlated with the position of Io, and the plasma downstream from Io is shown to be brighter in S III 685-A emission, which indicates a higher electron temperature. Differences in electron temperature inferred from spectral analyses account for all observed differences in brightness, implying that no change in the composition or density of the hot plasma occurs. The mechanism regulating the Io-related source is clearly distinct from the mechanism driving the local time source, although both draw on the same pool of energy, and the combination of the two sources is easily capable of supplying all the energy radiated by the torus.

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