Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Piccialli, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montmessin, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Belyaev, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mahieux, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorova, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marcq, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bertaux, J. -L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tellmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vandaele, A. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korablev, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language VERTICAL STRUCTURE; MESOSPHERE; THERMOSPHERE; TEMPERATURE; VERA; CO; CIRCULATION; MODEL; LAYER; WAVES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39787