Scattering Properties of the Venusian Clouds Observed by the UV Imager on board Akatsuki

We analyze the albedo of Venus obtained from the UV Imager on board Akatsuki. A relative global mean albedo over phase angle is used in this study, and we confirm the glory feature at 283 and 365 nm in the data acquired in 2016 May. We successfully simulate the observation using a radiative transfer...

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Bibliographic Details
Published in:The Astronomical journal 2017-08, Vol.154 (2), p.44
Main Authors: Lee, Y. J., Yamazaki, A., Imamura, T., Yamada, M., Watanabe, S., Sato, T. M., Ogohara, K., Hashimoto, G. L., Murakami, S.
Format: Article
Language:English
Subjects:
ABUNDANCE
ALBEDO
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CLOUDS
PLANETARY ATMOSPHERES
PLANETS
planets and satellites: atmospheres
RADIANT HEAT TRANSFER
SATELLITE ATMOSPHERES
SCATTERING
ULTRAVIOLET RADIATION
ultraviolet: planetary systems
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Summary:We analyze the albedo of Venus obtained from the UV Imager on board Akatsuki. A relative global mean albedo over phase angle is used in this study, and we confirm the glory feature at 283 and 365 nm in the data acquired in 2016 May. We successfully simulate the observation using a radiative transfer model. Our results show that cloud aerosols of m and (mode 2) can explain the glory, consistent with a property of aerosols previously suggested by using the Venus Monitoring Camera on board Venus Express. We find that SO2 and the unknown UV absorber are necessary factors to explain the decreasing trend of the observed relative albedo at phase angles larger than 10°. We suggest a range of possible SO2 abundance from 80 to 400 ppbv at the cloud top level, depending on atmospheric conditions assumed.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.3847/1538-3881/aa78a5