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Main Title: Spatial and Temporal Variability of the 365‐nm Albedo of Venus Observed by the Camera on Board Venus Express
Author(s): Lee, Yeon Joo
Kopparla, P.
Peralta, J.
Schröder, S. E.
Imamura, T.
Kouyama, T.
Watanabe, S.
Type: Article
Language Code: en
Abstract: We mapped the distribution of the 365‐nm albedo of the Venus atmosphere over the years 2006–2014, using images acquired by the Venus Monitoring Camera (VMC) on board Venus Express. We selected all images with a global view of Venus to investigate how the albedo depends on longitude. Bertaux et al. (2016, reported a peak in albedo around 100° longitude and speculated on an association with the Aphrodite Terra mountains. We show that this peak is most likely an artifact, resulting from long‐term albedo variations coupled with considerable temporal gaps in data sampling over longitude. We also used a subset of images to investigate how the albedo depends on local time, selecting only south pole viewing images of the dayside (local times 7–17 hr). Akatsuki observed mountain‐induced waves in the late afternoon at 283 nm and 10 μm (Fukuhara et al., 2017, We expect that the presence of such waves may introduce 365‐nm albedo variations with a periodicity of one solar day (116.75 Earth days). We searched for such a periodicity peak at 15:30–16:00 local time and low latitudes but did not find it. In conclusion, we find that temporal albedo variations, both short and long term, dominate any systematic variations with longitude and local time. The nature of VMC dayside observations limits regular data sampling along longitudes, so longitudinal variations, if they exist, are difficult to extract. We conclude that any influence by the Venus surface on 365‐nm albedo is negligible within this data set.
Issue Date: 15-Jun-2020
Date Available: 16-Dec-2020
DDC Class: 550 Geowissenschaften
Subject(s): Venus
image analysis
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
EC/H2020/841432/EU/Cloud Worlds: from Venus to Exoplanet/CLOUDWORLDS
Journal Title: Journal of Geophysical Research: Planets
Publisher: Wiley
Publisher Place: New York, NY
Volume: 125
Issue: 6
Article Number: e2019JE006271
Publisher DOI: 10.1029/2019JE006271
EISSN: 2169-9100
ISSN: 2169-9097
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

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