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Venus looks different from day to night across wavelengths: morphology from Akatsuki multispectral images.

ABSTRACT: Since insertion into orbit on December 7, 2015, the Akatsuki orbiter has returned global images of Venus from its four imaging cameras at eleven discrete wavelengths from ultraviolet (283 and 365 nm) and near infrared (0.9-2.3 µm), to the thermal infrared (8-12 µm) from a near-equatorial orbit. The Venus Express and Pioneer Venus Orbiter missions have also monitored the planet for long periods but from polar or near-polar orbits. The wavelength coverage and views of the planet also differ for all three missions. In reflected light, the images reveal features seen near the cloud tops (~ 70 km altitude), whereas in the near-infrared images of the nightside, features seen are at mid- to lower cloud levels (~ 48-60 km altitude). The dayside cloud cover imaged at the ultraviolet wavelengths shows morphologies similar to what was observed from Mariner 10, Pioneer Venus, Galileo, Venus Express and MESSENGER. The daytime images at 0.9 and 2.02 µm also reveal some interesting features which bear similarity to the ultraviolet images. The nighttime images at 1.74, 2.26 and 2.32 µm and at 8-12 µm reveal features not seen before and show new details of the nightside including narrow wavy ribbons, curved string-like features, long-scale waves, long dark streaks, isolated bright spots, sharp boundaries and even mesoscale vortices. Some features previously seen such as circum-equatorial belts (CEBs) and occasional areal brightenings at ultraviolet (seen in Venus Express observations) of the cloud cover at ultraviolet wavelengths have not been observed thus far. Evidence for the hemispheric vortex organization of the global circulation can be seen at all wavelengths on the day- and nightsides. Akatsuki images reveal new and puzzling morphology of the complex nightside cloud cover. The cloud morphologies provide some clues to the processes occurring in the atmosphere and are thus, a key diagnostic tool when quantitative dynamical analysis is not feasible due to insufficient information.

SUBMITTER: Limaye SS

PROVIDER: S-EPMC6954018 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Venus looks different from day to night across wavelengths: morphology from Akatsuki multispectral images.

Limaye Sanjay S SS Watanabe Shigeto S Yamazaki Atsushi A Yamada Manabu M Satoh Takehiko T Sato Takao M TM Nakamura Masato M Taguchi Makoto M Fukuhara Tetsuya T Imamura Takeshi T Kouyama Toru T Lee Yeon Joo YJ Horinouchi Takeshi T Peralta Javier J Iwagami Naomoto N Hashimoto George L GL Takagi Seiko S Ohtsuki Shoko S Murakami Shin-Ya SY Yamamoto Yukio Y Ogohara Kazunori K Ando Hiroki H Sugiyama Ko-Ichiro KI Ishii Nobuaki N Abe Takumi T Hirose Chikako C Suzuki Makoto M Hirata Naru N Young Eliot F EF Ocampo Adriana C AC

Earth, planets, and space : EPS 20180212 1

Since insertion into orbit on December 7, 2015, the Akatsuki orbiter has returned global images of Venus from its four imaging cameras at eleven discrete wavelengths from ultraviolet (283 and 365 nm) and near infrared (0.9-2.3 µm), to the thermal infrared (8-12 µm) from a near-equatorial orbit. The Venus Express and Pioneer Venus Orbiter missions have also monitored the planet for long periods but from polar or near-polar orbits. The wavelength coverage and views of the planet also differ for al ...[more]

PMID: 31983884

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Venus looks different from day to night across wavelengths: morphology from Akatsuki multispectral images.

Publications

Venus looks different from day to night across wavelengths: morphology from Akatsuki multispectral images.

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