Interpretation of electrostatic noise observed by Voyager 1 in Titan's wake

Details Interpretation of electrostatic noise observed by Voyager 1 in Titan's wake Interpretation of electrostatic noise observed by Voyager 1 in Titan's wake

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8595m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8595-8602. Previously announced in STAR as N87-16735

Physics

6

Earth Magnetosphere, Electric Fields, Electromagnetic Noise, Magnetospheric Ion Density, Plasma Interactions, Satellite Atmospheres, Saturn Atmosphere, Titan, Wakes, Broadband, Ion Beams, Low Frequencies, Plasma Resonance, Plasma Waves, Rotation, Voyager 1 Spacecraft, Saturn, Satellites, Titan, Electrostatics, Spacecraft Observations, Voyager 1 Mission, Wakes, Electrical Fields, Analysis, Interaction, Magnetosphere, Ions, Atmosphere, Plasma, Waves, Stability, Density, Corotation, Frequencies, Symmetry, Inte

Scientific paper

During the Voyager 1 spacecraft flyby of Titan on November 12, 1980, an intense broadband low frequency electric field noise was observed in the inbound wake. This so-called sheath noise is believed to be generated by an ion beam-plasma interaction between the ions in the corotational Saturnian magnetospheric plasma and nearly stationary plasma created by the ionization of Titan's atmosphere. The analysis is based on the information from Voyager 1 and reasonable assumptions. The results agree quite well with the observation. The analysis shows that the instability only occurs where the density of the corotational ions is comparable to the density of ions originating from Titan's atmosphere. The growth rate is high enough to generate the observed noise, and the calculated and observed frequency ranges are in good agreement.

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