Piccialli, A., Montmessin, F., Belyaev, D., Mahieux, A., Fedorova, A., Marcq, E., Bertaux, J. -L., Tellmann, S., Vandaele, A. C. and Korablev, O. (2015). Thermal structure of Venus nightside upper atmosphere measured by stellar occultations with SPICAV/Venus Express. Planet Space Sci., 113. S. 321 - 336. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0032-0633

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Abstract

The thermal structure of Venus upper atmosphere (90-140 km) was investigated using stellar occultation measurements acquired by the SPICAV experiment on board Venus Express. The SPICAV ultraviolet channel provides CO2 local density and temperature vertical profiles with a vertical resolution of <7 km of both the southern and the northern hemispheres on the nightside (18:00-06:00 h local time). A permanent layer of warm air is observed at the mesopause in the altitude range 90-100 km. Temperature then decreases with increasing altitude reaching a minimum value around 125 km. Spatial and temporal changes in the thermal structure have been analyzed. Local time variations dominate the structure of Venus atmosphere at these altitudes: temperatures show an increase of similar to 20 K on the morning side compared to the evening side. The homopause altitude was also determined; it varies between 119 and 138 km of altitude, increasing from the evening side to the morning side. SPICAV temperature profiles were compared to several literature results from ground-based observations, previous spacecraft missions and the Venus Express mission. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Piccialli, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montmessin, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Belyaev, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mahieux, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fedorova, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marcq, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bertaux, J. -L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tellmann, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vandaele, A. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korablev, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-397873
DOI: 10.1016/j.pss.2014.12.009
Journal or Publication Title: Planet Space Sci.
Volume: 113
Page Range: S. 321 - 336
Date: 2015
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication: OXFORD
ISSN: 0032-0633
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
VERTICAL STRUCTURE; MESOSPHERE; THERMOSPHERE; TEMPERATURE; VERA; CO; CIRCULATION; MODEL; LAYER; WAVESMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39787

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