Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..226c&link_type=abstract
Nature, vol. 290, Mar. 19, 1981, p. 226, 227.
Physics
33
Hydrogen Atoms, Iue, Lyman Alpha Radiation, Planetary Radiation, Saturn (Planet), Background Radiation, Limb Darkening, Resonance Scattering, Saturn Atmosphere, Solar Radiation, Titan, Saturn, Ultraviolet, Wavelengths, Bursts, Lyman-Alpha Radiation, Titan, Emissions, Copernicus Satellite, Pioneer 11, Source Medium, Rings, Iue, Satellites, Hydrogen, Observations, Swp, Short Wavelength Spectrograph, Brightness, Data, Models, Geometry, Sputtering
Scientific paper
A new investigation is reported of the potential sources of Ly-alpha emission in a series of observations of the Saturnian system carried out between January and July 1980 using the short wavelength spectrograph of the IUE Observatory. It is noted that north-south maps of the Ly-alpha emission across the planet disk show pronounced spatial asymmetries in emission brightness. These asymmetries vary to a marked extent on a time scale of days and are interpreted as bursts of Ly-alpha emission of as much as 1 kR brightness averaged over a 6 x 10 arcsec area, above a constant planetary emission level of 700-800 R. In fact, the Ly-alpha emission peaks manifest themselves as essentially point source features in these data; it is pointed out that if the emitting region is smaller than the 6 x 10 arcsec instrumental resolution, the surface brightness must be proportionally higher.
Atreya Sushil K.
Clarke John T.
Lane Arthur L.
Moos Warren H.
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