The injection of energy into the Io plasma torus

Details The injection of energy into the Io plasma torus The injection of energy into the Io plasma torus

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..219s&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 219-229.

Physics

Plasma Physics

44

Electron Energy, Energy Distribution, Extreme Ultraviolet Radiation, High Temperature Plasmas, Io, Toroidal Plasmas, Energy Transfer, Particle Interactions, Plasma Heating, Plasma Physics, Radial Distribution, Temperature Distribution, Voyager Project, Spectrometers, Distance, Ions, Relaxation, Cooling, Comparisons, Source, Brightness, Distribution, Emissions, Earth-Based Observations, Jupiter, Satellites, Io, Energy, Injection, Plasma Torus, Voyager, Parameters, Temperatures, Corotation, Morphology, Charac

Scientific paper

Voyager EUV observations of the Io plasma torus indicate the presence of an intensity modulation in the corotating reference frame of significant magnitude on a 10-hour time scale. The phenomenon has a persistence which suggests it is a permanent feature, and the magnitude is such that a substantial amount of energy is injected into the torus at a 10-hour periodic rate. An investigation is conducted regarding the nature of the energy enjection process as determined by the plasma parameters and the observed characteristics. Attention is given to excitation-relaxation relations, aspects of ion-electron relaxation, and electron-electron relaxation and energy transfer rates. The radial distribution of temperature at the eastern and western elongations is found to indicate that the energy input to the electrons is distributed over the width of the torus. The dominant mechanism of energy transport to the plasma appears to be electron-electron heating.

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