Dynamics of Planetary Upper Atmospheres - Part 2 (1083)

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Hst Proposal Id #4257

Scientific paper

Observations of planetary upper atmospheres through stellar occultations are of interest because they provide information about the radiative and dynamical processes at work in these rarefied regions (number density range: 10super13 - 10super15 cmsuper-3), which could be otherwise measured only through direct atmospheric probe launched from a spacecraft. One of the problems with interpretation of the temperature profiles obtained from ground-based occultation observations has been that the numerical inversion of the data is highly sensitive to photometric errors--especially in obtaining the mean temperature of the atmosphere. The much greater stability of photometry that is possible with the ST will allow us to obtain more accurate temperature profiles and permit a comparison of the atmospheric structures of the Jovian planets with much greater precision than has been possible in the past. We propose a series of three occultation observations for each Jovian

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