21 December 2000 Submillimeter limb-emission sounder JEM/SMILES aboard the Space Station
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A submillimeter limb-emission sounder, that is to be aboard the Japanese Experiment Module (JEM, dubbed as KIBO) at the International Space Station, has been designed. This payload, Superconducting Submillimeter-wave Limb-emission Sounder (SMILES), is aimed at global mappings of stratospheric trace gases by means of the most sensitive submillimeter receiver ever operated in space. Such sensitivity is ascribed to a Superconductor-Insulator- Superconductor (SIS) mixer, which is operated at 4.5 K in a dedicated cryostat combined with a mechanical cooler. SMILES will observe ozone-depletion-related molecules such as ClO, Hcl, HO2, HNO3, BrO and O3 in the frequency bands at 624.32-626.32 GHz and 649.12-650.32 GHz. A scanning antenna will cover tangent altitudes from 10 to 60 km in every 53 seconds, while tracing the latitudes form 38 S to 65 N along its orbit. This global coverage makes SMILES a useful tool of observing the low- and mid- latitudinal areas as well as the Arctic peripheral region. The molecular emissions will be detected by two units of acousto-optic spectrometers (AOS), each of which has coverage of 1.2 GHz with a resolution of 1.8 MHz. This high-resolution spectroscopy will allow us to detect weak emission lines attributing to less-abundant species.
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Junji Inatani, Hiroyuki Ozeki, Ryouta Satoh, Toshiyuki Nishibori, Naomi Ikeda, Yasunori Fujii, Takashi Nakajima, Yukiei Iida, Teruhito Iida, Ken'ichi Kikuchi, Takeshi Miura, Harunobu Masuko, Takeshi Manabe, Satoshi Ochiai, Masumichi Seta, Yoshihisa Irimajiri, Yasuko Kasai, Makoto Suzuki, Tomoko Shirai, Sho Tsujimaru, Kazuo Shibasaki, Masato Shiotani, "Submillimeter limb-emission sounder JEM/SMILES aboard the Space Station", Proc. SPIE 4152, Microwave Remote Sensing of the Atmosphere and Environment II, (21 December 2000); doi: 10.1117/12.410604; https://doi.org/10.1117/12.410604

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