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Temperature Variations in Titan's Upper Atmosphere: Impact on Cassini/Huygens : Volume 23, Issue 4 (03/06/2005)

By Kazeminejad, B.

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Book Id: WPLBN0003973919
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Temperature Variations in Titan's Upper Atmosphere: Impact on Cassini/Huygens : Volume 23, Issue 4 (03/06/2005)  
Author: Kazeminejad, B.
Volume: Vol. 23, Issue 4
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Schwingenschuh, K., Coustenis, A., Lammer, H., Witasse, O., Ball, A. J., Kazeminejad, B.,...Rucker, H. O. (2005). Temperature Variations in Titan's Upper Atmosphere: Impact on Cassini/Huygens : Volume 23, Issue 4 (03/06/2005). Retrieved from

Description: Space Research Institute, Austrian Academy of Sciences, A-8042 Graz, Austria. Temperature variations of Titan's upper atmosphere due to the plasma interaction of the satellite with Saturn's magnetosphere and Titan's high altitude monomer haze particles can imply an offset of up to ±30K from currently estimated model profiles. We incorporated these temperature uncertainties as an offset into the recently published Vervack et al. (2004) (Icarus, Vol. 170, 91-112) engineering model and derive extreme case (i.e. minimum and maximum profiles) temperature, pressure, and density profiles. We simulated the Huygens probe hypersonic entry trajectory and obtain, as expected, deviations of the probe trajectory for the extreme atmosphere models compared to the simulation based on the nominal one. These deviations are very similar to the ones obtained with the standard Yelle et al. (1997) (ESA SP-1177) profiles. We could confirm that the difference in aerodynamic drag is of an order of magnitude that can be measured by the probe science accelerometer. They represent an important means for the reconstruction of Titan's upper atmospheric properties. Furthermore, we simulated a Cassini low Titan flyby trajectory. No major trajectory deviations were found. The atmospheric torques due to aerodynamic drag, however, are twice as high for our high temperature profile as the ones obtained with the Yelle maximum profile and more than 5 times higher than the worst case estimations from the Cassini project. We propose to use the Cassini atmospheric torque measurements during its low flybys to derive the atmospheric drag and to reconstruct Titan's upper atmosphere density, pressure, and temperature. The results could then be compared to the reconstructed profiles obtained from Huygens probe measurements. This would help to validate the probe measurements and decrease the error bars.

Temperature variations in Titan's upper atmosphere: Impact on Cassini/Huygens


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