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Title:
Io plasma torus electrons - Voyager 1
Authors:
Sittler, E. C.; Strobel, D. F.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(Johns Hopkins University, Baltimore, MD)
Publication:
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 5741-5762. (JGR Homepage)
Publication Date:
06/1987
Category:
Lunar and Planetary Exploration; Satellites of Jupiter
Origin:
STI; LPI [AN-870395%J] ttp://www.sti.nasa.gov/STI-public-homepage.html
NASA/STI Keywords:
ELECTRON IMPACT, IO, PLASMA DIAGNOSTICS, SPACE PLASMAS, TOROIDAL PLASMAS, VOYAGER 1 SPACECRAFT, ELECTRIC FIELDS, HOT ELECTRONS, POSITIVE IONS, SATELLITE ATMOSPHERES
LPI Keywords:
JUPITER, SATELLITES, IO, PLASMA TORUS, ELECTRONS, VOYAGER 1, SOURCE, SPACECRAFT OBSERVATIONS, PLASMA SCIENCE EXPERIMENT, TEMPERATURE, ANALYSIS, DENSITY, THERMAL PROPERTIES, PRESSURE, ELECTRICAL FIELDS, CHARGE, WAVES, TURBULENCE, SCATTERING, SYMMETRY, ENERGY, IONIZATION, NEUTRAL PARTICLES, CORONAS, TRAJECTORY, EQUIPMENT, PLS, ORIGIN, LATITUDE, CALCULATIONS, EMISSIONS, DISTRIBUTION, IMPACTS, MAGNETOSPHERE
DOI:
10.1029/JA092iA06p05741
Bibliographic Code:
1987JGR....92.5741S

Abstract

A thermal Maxwellian component of the electron distribution function, together with a suprathermal, non-Maxwellian one, are featured in the present analysis of in situ plasma electron observations made by the Voyager 1 plasma science experiment in the Io plasma torus. A large difference in the hot electron pressure P(H) is noted between the inbound and the outbound data; this is interpreted as a latitudinal gradient, with P(H) being maximum at the magnetic equator. The presence of a neutral corona around Io is inferred from the observed decrease and symmetry with respect to Io of the cold electron temperature.
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