Universität zu Köln

Peralta, J., Hueso, R., Sanchez-Lavega, A., Lee, Y. J., Garcia-Munoz, A., Kouyama, T., Sagawa, H., Sato, T. M., Piccioni, G., Tellmann, S., Imamura, T. and Satoh, T. (2017). Stationary waves and slowly moving features in the night upper clouds of Venus. Nat. Astron., 1 (8). LONDON: NATURE PUBLISHING GROUP. ISSN 2397-3366

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Abstract

At the cloud top level of Venus (65-70 km altitude) the atmosphere rotates 60 times faster than the underlying surface-a phenomenon known as superrotation(1,2). Whereas on Venus's dayside the cloud top motions are well determined(3-6) and Venus general circulation models predict the mean zonal flow at the upper clouds to be similar on both the day and nightside(2), the nightside circulation remains poorly studied except for the polar region(7,8). Here, we report global measurements of the nightside circulation at the upper cloud level. We tracked individual features in thermal emission images at 3.8 and 5.0 pm obtained between 2006 and 2008 by the Visible and Infrared Thermal Imaging Spectrometer-Mapper onboard Venus Express and in 2015 by ground-based measurements with the Medium-Resolution 0.8-5.5 Micron Spectrograph and Imager at the National Aeronautics and Space Administration Infrared Telescope Facility. The zonal motions range from -110 to -60 m s(-1), which is consistent with those found for the dayside but with larger dispersion(6). Slow motions (-50 to -20m s(-1)) were also found and remain unexplained. In addition, abundant stationary wave patterns with zonal speeds from -10 to +10m s(-1) dominate the night upper clouds and concentrate over the regions of higher surface elevation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peralta, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hueso, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Lavega, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Y. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia-Munoz, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kouyama, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sagawa, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sato, T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Piccioni, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tellmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Imamura, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Satoh, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-224243
DOI:	10.1038/s41550-017-0187
Journal or Publication Title:	Nat. Astron.
Volume:	1
Number:	8
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2397-3366
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MONITORING CAMERA; WINDS; ATMOSPHERE; VIRTIS; RADIATION; VORTEX; LEVEL; TOPS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22424