Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9215110y&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 30, 1987, p. 15110-15124. NSERC-supported research.
Physics
31
Gas Giant Planets, Glow Discharges, Solar Flux, Spectrum Analysis, Uranus Atmosphere, Dayglow, Electron Distribution, Lyman Alpha Radiation, Ultraviolet Spectrometers, Voyager 2 Spacecraft
Scientific paper
A comparison is made of the observed properties of electroglow on Jupiter, Saturn, and Uranus. It is found that the subsolar electroglow intensity measured by the Voyager Ultraviolet Spectrometer in the spectral region below 1110 Å scales as the inverse square of heliocentric distance to within 10%. There are large differences between the spectra from Uranus and the Jovian and Saturnian spectra at longer wavelengths, but this is a consequence of the different scattering properties of the Uranian atmosphere and is not related to electroglow. Excellent fits are obtained between model calculations of the spectrum of Rayleigh-Raman scattered sunlight and the observed spectra from Uranus. It is also found that the local time variations of electroglow on all three planets are consistent with an excitation rate proportional to the solar flux. These correlations with solar flux suggest that electroglow is a direct consequence of the absorption of solar radiation in the upper atmospheres of the outer planets.
Broadfoot Lyle A.
McConnell John C.
Sandel Bill R.
Yelle Roger V.
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