Sodium remote from Io

Details Sodium remote from Io Sodium remote from Io

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...48..519b&link_type=abstract

Icarus, vol. 48, Dec. 1981, p. 519-535.

Astronomy and Astrophysics

Astronomy

26

Astronomical Spectroscopy, Emission Spectra, Io, Ion Production Rates, Jupiter Atmosphere, Line Spectra, Sodium, Abundance, Atomic Collisions, Atomic Spectra, Elastic Scattering, Plasmasphere, Spectral Resolution, Spectral Signatures, Jupiter, Sodium, Emissions, Magnetosphere, Kinematics, Plasma, Spectra, Collisions, Velocity, Satellites, Io, Earth-Based Observations, Diagrams, Spectroscopy, Calculations, Production Rates

Scientific paper

Measurements of sodium emission lines originating in the middle Jupiter magnetosphere are measured, confirming the wide dispersal of neutral sodium in the Jovian system in at least two distinct manifestations. Candidate neutral transport processes in the context of the observed kinematical signatures are discussed. It is argued that the normal emission feature is produced by sodium atoms on bound elliptical orbits originating in the Io sodium cloud but with apojove in the field of view. Observations of the fast sodium feature indicate that atoms episodically acquire a broad range of line-of-sight velocities above the Jupiter gravitational escape speed and far above the speeds characteristic of surface-sputtered atoms. Three suggested reactions are distinguished according to (1) production rates based on estimated plasmaspheric properties, (2) kinematical signature, and (3) the timing of occurrences of the fast sodium feature.

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