Voyager U.V. spectrometer observations of He 584 Å dayglow at Jupiter |
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Authors: | John C McConnell Bill R Sandel ALyle Broadfoot |
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Institution: | Earth and Space Sciences Institute, University of Southern California, Tucson Laboratories, Tucson, AZ 85713, U.S.A. |
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Abstract: | The intensity of Jupiter's He 584 Å airglow has been measured by the Voyager U.V. spectrometers. The disc-averaged brightness is about 4 Rs and limb darkening is present. The intensity probably varies with longitude, the variation being out of phase with the H Lyman-α intensity bulge. Modelling of resonance scattering of the solar He 584 Å line by Jupiter's atmosphere has shown that the hydrogen and helium emissions can be explained about equally well by at least two self-consistent scenarios involving the structure (temperature and eddy diffusion coefficient) and excitation of the atmosphere. All our evidence points to a dramatic change of conditions in the Jovian atmosphere in the time between Pioneer and Voyager encounters. |
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