Thermal structure of Venus nightside upper atmosphere measured by stellar occultations with SPICAV/Venus Express

被引：40
作者：
Piccialli, A. [1 ,2 ]
Montmessin, F. [1 ]
Belyaev, D. [3 ,4 ]
Mahieux, A. [5 ,6 ,7 ]
Fedorova, A. [3 ,4 ]
Marcq, E. [1 ]
Bertaux, J. -L. [1 ]
Tellmann, S. [8 ]
Vandaele, A. C. [5 ]
Korablev, O. [3 ,4 ]
机构：
[1] CNRS, LATMOS, UVSQ, IPSL, F-78280 Guyancourt, France
[2] Univ Paris Diderot, Observ Paris, LESIA, CNRS,UPMC, F-92195 Meudon, France
[3] Space Res Inst IKI, Moscow 117810, Russia
[4] MIPT, Dolgoprudnyi 141700, Russia
[5] Belgian Inst Space Aeron, Planetary Aeron, B-1180 Brussels, Belgium
[6] Fonds Natl Rech Sci, B-1000 Brussels, Belgium
[7] Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA
[8] Univ Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, D-50931 Cologne, Germany
来源：
PLANETARY AND SPACE SCIENCE | 2015年 / 113卷
关键词：
Venus; Atmosphere; Atmospheres; Structure; Occultations; Spectroscopy; VERTICAL STRUCTURE; MESOSPHERE; THERMOSPHERE; TEMPERATURE; VERA; CO; CIRCULATION; MODEL; LAYER; WAVES;
D O I：
10.1016/j.pss.2014.12.009
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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收藏
页码：321 / 335
页数：15
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