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Vertical distribution of NH3 in the upper Jovian atmosphere from IUE observations |
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| Authors: | M Combes Th Encrenaz R Courtin J Caldwell T Owen V Moore R Courtin KH Fricke V Moore PS Butterworth |
| Institution: | Observatoire de Paris-Meudon, 92190 Meudon, France;On leave from: LPSP, 91370 Verrières-le-Buisson, France;Laboratory for Planetary Atmospheres Research, SUNY, Stony Brook, NY 11794, USA;Physikalisches Institut, Universität Bonn, 5300 Bonn 1, FRG;Laboratory for Planetary Atmospheres, University College London, UK;Department of Astronomy, University of Leicester, UK |
| Abstract: | The first unambiguous identification of ammonia in the upper atmosphere of Jupiter has been obtained from the observation of individual NH3 bands in an IUE high resolution spectrum in the 2100–2400 Å spectral range. The variation with wavelength of the strengths of these NH3 bands implies that the NH3 abundance has to be strongly reduced by photolysis in the upper jovian atmosphere. Preliminary analysis by means of scattering models shows that the ammonia mixing ratio cannot be constant with altitude. The mixing ratio NH3/H2 ranges from 5 10?8 to 5 10?7 at the 250 mb pressure level, and decreases as P or P2 toward higher altitudes. |
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