Observations of the Jovian UV aurora by Voyager

Details Observations of the Jovian UV aurora by Voyager Observations of the Jovian UV aurora by Voyager

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3141h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3141-3154.

Physics

63

Auroral Spectroscopy, Jupiter Atmosphere, Planetary Radiation, Ultraviolet Spectrometers, Voyager Project, Io, Particle Precipitation, Planetary Magnetic Fields, Planetary Magnetospheres, Jupiter, Auroras, Voyager Missions, Spacecraft Observations, Ultraviolet, Wavelengths, Ultraviolet Spectrometer Instrument, Uvs, Analysis, Geometry, Intensity, Optical Properties, Depth, Longitude, Charged Particles, Ions, Electrons, Hypotheses, Scattering, Models, Satellites, Io, Diagrams, Spectra, Parameters, Calculation

Scientific paper

The observations of the Jovian aurora made by the Voyager UV spectrometer (UVS) during 1979 are analyzed, with special consideration given to the model fitting process. Several different estimates of the function specifying auroral arc geometry were tried, with the Broadfoot et al. (1981) estimate, found by probing with the tip of the UVS slit, giving the best agreement; this agreement is slightly better than the agreement with the Io torus footprint computed by Roederer et al. (1977). The results suggest that the UVS observations are more sensitive to the surface field geometry than are the Voyager flyby in situ observations. The results of a study of intensity maximum positions indicate that the particles exciting the spatially variable portion of the aurora are drifting west, implying either that these particles are electrons or that they are positive ions drifting east more slowly than the corotation lag of the Io torus region carries them to the west. The latter case is most consistent with the high-energy charged particle measurements.

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