Jovian auroral secondary electrons and their influence on the Io plasma torus

Details Jovian auroral secondary electrons and their influence on the Io plasma torus Jovian auroral secondary electrons and their influence on the Io plasma torus

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..509t&link_type=abstract

Geophysical Research Letters, vol. 8, May 1981, p. 509-512.

Physics

41

Auroral Zones, Electron Precipitation, Io, Satellite Atmospheres, Secondary Emission, Toroidal Plasmas, Atmospheric Ionization, Electron Emission, Gas Ionization, Magnetospheric Electron Density, Planetary Magnetospheres, Ultraviolet Radiation, Jupiter, Electrons, Satellites, Plasmas, Toruses, Energy, Injection, Emissions, Ultraviolet, Ionization, Ions, Magnetosphere, Altitude, Flux, Mathematical Models, Diagrams, Io

Scientific paper

Based on the analysis of the Io plasma torus energetics and Jovian auroral energy dissipation, a suggestion is made that the more intense auroral dissipation provides a source of superthermal secondary electrons capable of exciting the torus UV emissions. The electron heat flux to the magnetosphere can exceed 1% of the auroral dissipation if the dominant precipitation flux consists of heavy ions, O(+) or S(+), with an energy between 100 and 1000 keV. This could provide the source of electron energy required to balance radiative loss from the Io torus and it would inject ionospheric H(+) ions into the magnetosphere at a rate (2 x 10 to the 29th per s) comparable to the upper estimate of heavy ion injection near Io.

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