Venus upper atmosphere winds from ground-based heterodyne spectroscopy of CO2 at 10 μm wavelength

被引：39

作者：

Sornig, M. ^{[1
]}

Livengood, T. ^{[2
,3
]}

Sonnabend, G. ^{[1
]}

Kroetz, P. ^{[1
]}

Stupar, D. ^{[1
]}

Kostiuk, T. ^{[2
]}

Schieder, R. ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] USRA, Columbia, MD 21044 USA

来源：

PLANETARY AND SPACE SCIENCE | 2008年 / 56卷 / 10期

基金：

美国国家科学基金会;

关键词：

Venus; Planetary atmospheres; Non-LTE; Mid-infrared; Heterodyne; Dynamics;

D O I：

10.1016/j.pss.2008.05.006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report observations of Venus atmospheric wind near 110 km altitude by means of high-resolution mid-infrared spectroscopy. Data were acquired May 28-June 4, 2007 at the McMath-Pierce Solar Telescope (Kitt Peak, Arizona, USA), during a coordinated groundbased observing campaign in support of Venus Express. The Cologne Tuneable Heterodyne Infrared Spectrometer (THIS) was used to measure the Doppler shift of fully resolved non-LTE emission lines Of CO2 at 959.3917 cm(-1) (10.423 mu m) to determine wind velocity. Spatial resolution was similar to 1.7 arcsec on Venus' apparent diameter of 20-22 arcsec. Zonal wind velocities were retrieved at six different latitudes close to the west limb. Retrieved zonal velocities-parallel to Venus' retrograde solid body rotation-range 3 +/- 7 m/s (1 sigma) at the equator to a maximum of 32 +/- 4 m/s (1 sigma) at southern mid-latitude (45 degrees S), decreasing at higher latitudes and thus suggesting a retrograde double jet structure for the zonal component. The subsolar-to-antisolar circulation component was measured at one position, 45 degrees towards the sunlit limb from the central meridian, on the equator. The retrieved subsolar-to-antisolar component at this position implies a cross-terminator velocity of 52 +/- 18 m/s (1 sigma). Retrieved velocities are lower than previous results, suggesting spatial and/or temporal variability of dynamics in the mesosphere/thermosphere of Venus. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1399 / 1406

页数：8