Voids in Jovian magnetosphere revisited - Evidence of spacecraft charging

Details Voids in Jovian magnetosphere revisited - Evidence of spacecraft charging Voids in Jovian magnetosphere revisited - Evidence of spacecraft charging

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213399k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13399-13408.

Physics

5

Charged Particles, Electron Energy, Ganymede, Jupiter Atmosphere, Planetary Magnetospheres, Plasma Density, Cold Plasmas, Energetic Particles, Spacecraft Trajectories, Voyager 2 Spacecraft, Jupiter, Magnetosphere, Spacecraft, Voyager 2 Mission, Pls Instrument, Ions, Flux, Electrons, Lecp Instrument, Analysis, Spacecraft Observations, Magnetic Properties, Charged Particles, Distribution, Plasma, Density, Satellites, Ganymede, Anomalies, Diagrams, Hypothesis

Scientific paper

The Voyager 2 Plasma Science Instrument (PLS) measuring cold plasma number density observed about a dozen 'voids', lasting from a few minutes to 20 min, in the vicinity of the Ganymede-orbit crossing, when the low-energy ion and electron fluxes recorded fell to very low levels. Original interpretations associated these 'voids' with Ganymede wake effects. In the present study, the PLS data are reexamined, in conjunction with data from the magnetic field experiment and the low-energy charged particle (LECP) experiment. The LECP data showed that the PLS voids were accompanied by large enhancements of the flux of energetic electrons and ions, while the magnetic data exhibited no systematic signatures. It is suggested that increased energetic electron fluxes in the void regions intermittently charged the spacecraft negatively to values between a few kV and a few tens of kV, and that spacecraft charging could have produce dropouts in the measured cold ion and electron fluxes and enhancements in the measured fluxes of hot particles consistent with the observations.

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