Voyager 2 electron observations in the magnetosphere of Neptune

Details Voyager 2 electron observations in the magnetosphere of Neptune Voyager 2 electron observations in the magnetosphere of Neptune

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619085z&link_type=abstract

Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 19,085-19,100.

Physics

17

Magnetospheric Electron Density, Neptune (Planet), Planetary Magnetospheres, Voyager 2 Spacecraft, Electron Energy, Magnetic Field Configurations, Particle Precipitation, Plasma Diffusion, Spectrum Analysis, Toroids, Triton

Scientific paper

This paper describes electron data obtained during the Neptune encounter by the Voyager 2 plasma science experiment. The densities and temperatures of low-energy (10-5950 eV) electrons and the electrostatic potential of the spacecraft near Neptune are derived. The data indicate that the escape of charged particles from Triton and the local ionization of atoms in the neutral torus originating from Triton are the major plasma sources. It is inferred that this neutral torus of hydrogen atoms has a density of about 300/cu cm and an inner boundary at 8 R(N). The data near Neptune exhibit signatures suggesting that both precipitation into Neptune's atmosphere and ring absorption are important plasma loss mechanisms. Plasma transport in the magnetosphere appears to be very fast; the diffusion coefficient is 1 x 10 exp -7 L exp 3 R(N) exp 2/sec.

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