Williams DJ, Mauk BH, McEntire RE, Roelof EC, Armstrong TP, Wilken B, Roederer JG, Krimigis SM, Fritz TA, Lanzerotti LJ. Electron beams and ion composition measured at Io and in its torus.
Science 1996;
274:401-3. [PMID:
8832885 DOI:
10.1126/science.274.5286.401]
[Citation(s) in RCA: 108] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Intense, magnetic field-aligned, bidirectional, energetic (>15 kiloelectron volts) electron beams were discovered by the Galileo energetic particles detector during the flyby of Io. These beams can carry sufficient energy flux into Jupiter's atmosphere to produce a visible aurora at the footprint of the magnetic flux tube connecting Io to Jupiter. Composition measurements through the torus showed that the spatial distributions of protons, oxygen, and sulfur are different, with sulfur being the dominant energetic (> approximately 10 kiloelectron volts per nucleon) ion at closest approach.
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