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Main Title: Venus Upper Clouds and the UV Absorber From MESSENGER/MASCS Observations
Author(s): Pérez-Hoyos, Santiago
Sánchez‐Lavega, Agustin
García Muñoz, Antonio
Irwin, Patrick G. J.
Peralta, Javier
Holsclaw, Gregory
McClintock, William
Sanz‐Requena, José Francisco
Type: Article
Language Code: en
Abstract: One of the most intriguing, long‐standing questions regarding Venus's atmosphere is the origin and distribution of the unknown UV absorber, responsible for the absorption band detected at the near‐UV and blue range of Venus's spectrum. In this work, we use data collected by Mercury Atmospheric and Surface Composition Spectrometer (MASCS) spectrograph on board the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission during its second Venus flyby in June 2007 to address this issue. Spectra range from 0.3 μm to 1.5 μm including some gaseous H2O and CO2 bands, as well as part of the SO2 absorption band and the core of the UV absorption. We used the NEMESIS radiative transfer code and retrieval suite to investigate the vertical distribution of particles in the equatorial atmosphere and to retrieve the imaginary refractive indices of the UV absorber, assumed to be well mixed with Venus's small mode 1 particles. The results show a homogeneous equatorial atmosphere, with cloud tops (height for unity optical depth) at 75 ± 2 km above surface. The UV absorption is found to be centered at 0.34 ± 0.03 μm with a full width at half maximum of 0.14 ± 0.01 μm. Our values are compared with previous candidates for the UV aerosol absorber, among which disulfur oxide (S2O) and dioxide disulfur (S2O2) provide the best agreement with our results.
Issue Date: 5-Jan-2018
Date Available: 9-Dec-2019
DDC Class: 550 Geowissenschaften
Subject(s): venus
radiative transfer
Journal Title: Journal of Geophysical Research: Planets
Publisher: American Geophysical Union
Publisher Place: Hoboken, NJ
Volume: 123
Issue: 1
Publisher DOI: 10.1002/2017JE005406
Page Start: 145
Page End: 162
EISSN: 2169-9100
ISSN: 2169-9097
Notes: ©2018. American Geophysical Union.
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

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