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Long-term variations of the UV contrast on Venus observed by the Venus Monitoring Camera on board Venus Express

Lee, Y.J. and Imamura, T. and Schröder, S.E. and Marcq, E. (2015) Long-term variations of the UV contrast on Venus observed by the Venus Monitoring Camera on board Venus Express. Icarus, 253, pp. 1-15. Elsevier. DOI: 10.1016/j.icarus.2015.02.015 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2015.02.015

Abstract

We analyze the Venus ultraviolet (UV) reflectivity as observed by the Venus Monitoring Camera on board Venus Express over 2000 orbits in the years 2006 to 2011. We compare several laws for the photometric correction of global images of Venus, and find that the combined law of Lambert and Lommel-Seeliger is most suitable for our study. Our analysis of the corrected images reveals strong fluctuations in the reflectivity contrast between low and high latitude regions of up to 40%, that follow variations of the SO2 abundance above the cloud top. Additionally, the phase angle dependence of the contrast gradually change from weak to strong, which may be related with the vertical distribution of the unknown UV absorber and the overlaying upper haze layer. We suggest that these variations result from a combination of two processes. One is the meridional transport of SO2, which forms sulfuric acid aerosol particles at high latitudes. The other is the presence of vertical winds near the cloud top level, which control the vertical mixing of the unknown UV absorber and the upper haze.

Item URL in elib:https://elib.dlr.de/95509/
Document Type:Article
Title:Long-term variations of the UV contrast on Venus observed by the Venus Monitoring Camera on board Venus Express
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lee, Y.J.leeyj (at) ac.jaxa.jpUNSPECIFIED
Imamura, T.imamura.takeshi (at) jaxa.jpUNSPECIFIED
Schröder, S.E.stefanus.schroeder (at) dlr.deUNSPECIFIED
Marcq, E.emmanuel.marcq (at) latmos.ipsl.frUNSPECIFIED
Date:1 June 2015
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:253
DOI :10.1016/j.icarus.2015.02.015
Page Range:pp. 1-15
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Venus; Atmosphere; Photometry; Ultraviolet observations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Venus Express Kamera (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Schröder, Dr. Stefan
Deposited On:23 Mar 2015 14:45
Last Modified:06 Sep 2019 15:26

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