LIR: Longwave infrared camera onboard the venus orbiter Akatsuki

Tetsuya Fukuhara; Makoto Taguchi; Takeshi Imamura; Masato Nakamura; Munetaka Ueno; Makoto Suzuki; Naomoto Iwagami; Mitsuteru Sato; Kazuaki Mitsuyama; George L. Hashimoto; Ryo Ohshima; Toru Kouyama; Hiroki Ando; Masahiko Futaguchi

doi:10.5047/eps.2011.06.019

LIR: Longwave infrared camera onboard the venus orbiter Akatsuki

Tetsuya Fukuhara, Makoto Taguchi, Takeshi Imamura, Masato Nakamura, Munetaka Ueno, Makoto Suzuki, Naomoto Iwagami, Mitsuteru Sato, Kazuaki Mitsuyama, George L. Hashimoto, Ryo Ohshima, Toru Kouyama, Hiroki Ando, Masahiko Futaguchi

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

The Longwave Infrared Camera (LIR) is one of a suite of cameras onboard the Venus orbiter Akatsuki. It will take images of thermal radiation in the wavelength range of 8-12 μm emitted by the Venus cloud tops. The use of an uncooled micro-bolometer array as an infrared image sensor makes LIR a lightweight, small and low-power consumption instrument with a required noise equivalent temperature difference of 0.3 K. Temperature and horizontal wind fields at the cloud-top will be retrieved for both dayside and nightside with equal quality. This will provide key observations to understand the mechanism of super rotation and the thermal budget of the planet. LIR will also monitor variations of the polar dipole and collar which are characteristic thermal features in the Venusian atmosphere. Mechanisms of the upper-cloud formation will be investigated using sequences of close-up images. The morphology of the nightside upper cloud will be studied in detail for the first time.

Original language	English
Pages (from-to)	1009-1018
Number of pages	10
Journal	Earth, Planets and Space
Volume	63
Issue number	9
DOIs	https://doi.org/10.5047/eps.2011.06.019
Publication status	Published - 2011

Keywords

Atmosphere
Planet-C
Venus

ASJC Scopus subject areas

Geology
Space and Planetary Science

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10.5047/eps.2011.06.019

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title = "LIR: Longwave infrared camera onboard the venus orbiter Akatsuki",

abstract = "The Longwave Infrared Camera (LIR) is one of a suite of cameras onboard the Venus orbiter Akatsuki. It will take images of thermal radiation in the wavelength range of 8-12 μm emitted by the Venus cloud tops. The use of an uncooled micro-bolometer array as an infrared image sensor makes LIR a lightweight, small and low-power consumption instrument with a required noise equivalent temperature difference of 0.3 K. Temperature and horizontal wind fields at the cloud-top will be retrieved for both dayside and nightside with equal quality. This will provide key observations to understand the mechanism of super rotation and the thermal budget of the planet. LIR will also monitor variations of the polar dipole and collar which are characteristic thermal features in the Venusian atmosphere. Mechanisms of the upper-cloud formation will be investigated using sequences of close-up images. The morphology of the nightside upper cloud will be studied in detail for the first time.",

keywords = "Atmosphere, Planet-C, Venus",

author = "Tetsuya Fukuhara and Makoto Taguchi and Takeshi Imamura and Masato Nakamura and Munetaka Ueno and Makoto Suzuki and Naomoto Iwagami and Mitsuteru Sato and Kazuaki Mitsuyama and Hashimoto, {George L.} and Ryo Ohshima and Toru Kouyama and Hiroki Ando and Masahiko Futaguchi",

year = "2011",

doi = "10.5047/eps.2011.06.019",

language = "English",

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pages = "1009--1018",

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AU - Fukuhara, Tetsuya

AU - Taguchi, Makoto

AU - Imamura, Takeshi

AU - Nakamura, Masato

AU - Ueno, Munetaka

AU - Suzuki, Makoto

AU - Iwagami, Naomoto

AU - Sato, Mitsuteru

AU - Mitsuyama, Kazuaki

AU - Hashimoto, George L.

AU - Ohshima, Ryo

AU - Kouyama, Toru

AU - Ando, Hiroki

AU - Futaguchi, Masahiko

PY - 2011

Y1 - 2011

N2 - The Longwave Infrared Camera (LIR) is one of a suite of cameras onboard the Venus orbiter Akatsuki. It will take images of thermal radiation in the wavelength range of 8-12 μm emitted by the Venus cloud tops. The use of an uncooled micro-bolometer array as an infrared image sensor makes LIR a lightweight, small and low-power consumption instrument with a required noise equivalent temperature difference of 0.3 K. Temperature and horizontal wind fields at the cloud-top will be retrieved for both dayside and nightside with equal quality. This will provide key observations to understand the mechanism of super rotation and the thermal budget of the planet. LIR will also monitor variations of the polar dipole and collar which are characteristic thermal features in the Venusian atmosphere. Mechanisms of the upper-cloud formation will be investigated using sequences of close-up images. The morphology of the nightside upper cloud will be studied in detail for the first time.

AB - The Longwave Infrared Camera (LIR) is one of a suite of cameras onboard the Venus orbiter Akatsuki. It will take images of thermal radiation in the wavelength range of 8-12 μm emitted by the Venus cloud tops. The use of an uncooled micro-bolometer array as an infrared image sensor makes LIR a lightweight, small and low-power consumption instrument with a required noise equivalent temperature difference of 0.3 K. Temperature and horizontal wind fields at the cloud-top will be retrieved for both dayside and nightside with equal quality. This will provide key observations to understand the mechanism of super rotation and the thermal budget of the planet. LIR will also monitor variations of the polar dipole and collar which are characteristic thermal features in the Venusian atmosphere. Mechanisms of the upper-cloud formation will be investigated using sequences of close-up images. The morphology of the nightside upper cloud will be studied in detail for the first time.

KW - Atmosphere

KW - Planet-C

KW - Venus

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LIR: Longwave infrared camera onboard the venus orbiter Akatsuki

Abstract

Keywords

ASJC Scopus subject areas

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