Voyager observations of ion phase space densities in the Jovian magnetosphere

Details Voyager observations of ion phase space densities in the Jovian magnetosphere Voyager observations of ion phase space densities in the Jovian magnetosphere

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..521p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 521-525.

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Jupiter Atmosphere, Magnetospheric Ion Density, Planetary Magnetospheres, Space Density, Voyager 1 Spacecraft, Charged Particles, Diffusion Coefficient, Energy Spectra, Pitch (Inclination), Jupiter, Voyager Missions, Observations, Ions, Phases, Magnetosphere, Density, Low Energy Charged Particle Instrument, Lecp, Calculations, Particles, Flux, Parameters, Distribution, Energy, Spectra, Models, Diffusion, Magnetic Effects, Satellites, Io, Plasma Torus, Waves

Scientific paper

Data from the Voyager low-energy charged particle experiment (LECP) were used to calculate ion phase space densities in Jupiter's magnetosphere. The calculation of F at constant mu and J(2) requires the determination of particle fluxes at specific pitch angles and energies. It is shown that the greatest uncertainties in the determination of F from LECP data arise from the fits to the measured pitch angle distributions and differential energy spectra. An estimate is provided of this uncertainty and of others arising from model radial diffusion coefficients and magnetic fields. The general nature of the curves is consistent with inward diffusion of these energetic ions from the outer magnetosphere combined with losses near but starting beyond the orbit of Io. These losses are not consistent with simple satellite sweeping by Io alone and are probably due to an Io-torus wave-particle interaction. The lifetime against loss deduced from the data is approximately 20,000 s near Io and is a value consistent with strong diffusion losses. The measured ion loss rate declines much more rapidly than the strong diffusion loss rate as L increases from 7 to 9, suggesting that the loss rate is well below the strong-diffusion rate beyond 7 Jupiter radii for ions observed by the LECP.

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