On the analysis of the H Lyman- α dayglow of Jupiter, Saturn and Uranus
Identifieur interne : 001421 ( Istex/Corpus ); précédent : 001420; suivant : 001422On the analysis of the H Lyman- α dayglow of Jupiter, Saturn and Uranus
Auteurs : C. Emerich ; L. Ben Jaffel ; R. PrangéSource :
- Planetary and Space Science [ 0032-0633 ] ; 1993.
Abstract
A new radiative transfer model, particularly well adapted to calculations in inhomogeneous atmospheres, has been applied, during the last 4 years, to analyse new and older Lyman-α airglow data from three giant planets. We review all the results obtained so far. Several features which were not accounted for by using the previous transfer codes have been satisfactorily simulated, using essentially the scattering of the solar and the interplanetary Lyman-α lines by hydrogen in the upper atmospheres. The search for a good fit both in intensity and in shape of the limb to limb data, and/or of the line profiles, provided constraints on the dynamics of the atmospheres, through the estimate of either the eddy diffusion coefficient, the total [H] column density, or of the possibility of some nonthermal turbulence processes at high altitude. Consequently, the need for an “electroglow” process for the Lyman-α emission was considerably reduced and may be dismissed in the majority of cases.
Url:
DOI: 10.1016/0032-0633(93)90070-I
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<front><div type="abstract" xml:lang="en">A new radiative transfer model, particularly well adapted to calculations in inhomogeneous atmospheres, has been applied, during the last 4 years, to analyse new and older Lyman-α airglow data from three giant planets. We review all the results obtained so far. Several features which were not accounted for by using the previous transfer codes have been satisfactorily simulated, using essentially the scattering of the solar and the interplanetary Lyman-α lines by hydrogen in the upper atmospheres. The search for a good fit both in intensity and in shape of the limb to limb data, and/or of the line profiles, provided constraints on the dynamics of the atmospheres, through the estimate of either the eddy diffusion coefficient, the total [H] column density, or of the possibility of some nonthermal turbulence processes at high altitude. Consequently, the need for an “electroglow” process for the Lyman-α emission was considerably reduced and may be dismissed in the majority of cases.</div>
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