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Investigation of UV Absorbers on Venus Using the 283 and 365 nm Phase Curves Obtained From Akatsuki

Lee, Yeon Joo and Garcia Munoz, A. and Yamakazi, A. and Yamada, M. and Watanabe, S. and Encrenaz, E.T. (2021) Investigation of UV Absorbers on Venus Using the 283 and 365 nm Phase Curves Obtained From Akatsuki. Geophysical Research Letters, 48 (7), e90577. Wiley. doi: 10.1029/2020GL090577. ISSN 0094-8276.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL090577


The so-called unknown absorber in the clouds of Venus is an important absorber of solar energy, but its vertical distribution remains poorly quantified. We analyze the 283 and 365 nm phase curves of the disk-integrated albedo measured by Akatsuki. Based on our models, we find that the unknown absorber can exist either well mixed over the entire upper cloud or within a thin layer. The necessary condition to explain the 365 nm phase curve is that the unknown absorber must absorb efficiently within the cloud scale height immediately below the cloud top. Using this constraint, we attempt to extract the SO2 abundance from the 283 nm phase curve. However, we cannot disentangle the absorption by SO2 and by the unknown absorber. Considering previous SO2 abundance measurements at midinfrared wavelengths, the required absorption coefficient of the unknown absorber at 283 nm must be more than twice that at 365 nm.

Item URL in elib:https://elib.dlr.de/146137/
Document Type:Article
Title:Investigation of UV Absorbers on Venus Using the 283 and 365 nm Phase Curves Obtained From Akatsuki
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lee, Yeon Jooyeon.lee (at) dlr.dehttps://orcid.org/0000-0002-4571-0669
Garcia Munoz, A.AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0003-1756-4825
Yamakazi, A.Institute of Space and Astronautical Science (ISAS/JAXA), Sagamihara, Japan; Graduate School of Science, University of Tokyo, Tokyo, JapanUNSPECIFIED
Yamada, M.Planetary Exploration Research Center (PERC), Narashino, JapanUNSPECIFIED
Watanabe, S.Space Information Center, Hokkaido Information University, Ebetsu, JapanUNSPECIFIED
Encrenaz, E.T.lesia observatoire de paris, meudon, franceUNSPECIFIED
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e90577
Keywords:Venus, UV spectroscopy, Akatsuki
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Cabrera Perez, Juan
Deposited On:24 Nov 2021 13:42
Last Modified:24 Nov 2021 13:42

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