Dr. Tetsuya Watanabe Profile

Dr. Tetsuya Watanabe

Professor at National Astronomical Observatory Japan

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Author

Publications (7)

Proceedings Article | 13 December 2020 Presentation + Paper

The Solar-C (EUVST) mission: the latest status

Toshifumi Shimizu, Shinsuke Imada, Tomoko Kawate, Yoshinori Suematsu, Hirohisa Hara, Toshihiro Tsuzuki, Yukio Katsukawa, Masahito Kubo, Ryoko Ishikawa, Tetsuya Watanabe, Shin Toriumi, Kiyoshi Ichimoto, Shin'ichi Nagata, Takahiro Hasegawa, Takaaki Yokoyama, Kyoko Watanabe, Katsuhiko Tsuno, Clarence Korendyke, Harry Warren, Bart De Pontieu, Paul Boerner, Sami Solanki, Luca Teriaca, Udo Schuehle, Sarah Matthews, David Long, William Thomas, Barry Hancock, Hamish Reid, Andrzej Fludra, Frederic Auchère, Vincenzo Andretta, Giampiero Naletto, Luca Poletto, Louise Harra

Proceedings Volume 11444, 114440N (2020) https://doi.org/10.1117/12.2560887

KEYWORDS: Extreme ultraviolet, Spectroscopy, Telescopes, Solar processes, Spectrographs, Imaging systems, Coronagraphy, Spatial resolution, Cameras, Mirrors

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Proceedings Article | 9 September 2019 Presentation + Paper

The Solar-C_EUVST mission

Toshifumi Shimizu, Shinsuke Imada, Tomoko Kawate, Kiyoshi Ichimoto, Yoshinori Suematsu, Hirohisa Hara, Yukio Katsukawa, Masahito Kubo, Shin Toriumi, Tetsuya Watanabe, Takaaki Yokoyama, Clarence Korendyke, Harry Warren, Ted Tarbell, Bart De Pontieu, Luca Teriaca, Udo Schühle, Sami Solanki, Louise Harra, Sarah Matthews, A. Fludra, F. Auchère, V. Andretta, G. Naletto, A. Zhukov

Proceedings Volume 11118, 1111807 (2019) https://doi.org/10.1117/12.2528240

KEYWORDS: Solar processes, Space operations, Imaging systems

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Proceedings Article | 2 August 2014 Paper

The Solar-C Mission

Tetsuya Watanabe

Proceedings Volume 9143, 91431O (2014) https://doi.org/10.1117/12.2055366

KEYWORDS: Space telescopes, Telescopes, Solar processes, Magnetism, Spatial resolution, Space operations, X-ray telescopes, Plasmas, Imaging systems, Coronagraphy

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Proceedings Article | 6 October 2011 Paper

The SOLAR-C mission: current status

Toshifumi Shimizu, Saku Tsuneta, Hirohisa Hara, Kiyoshi Ichimoto, Kanya Kusano, Taro Sakao, Takashi Sekii, Yoshinori Suematsu, Tetsuya Watanabe

Proceedings Volume 8148, 81480B (2011) https://doi.org/10.1117/12.893228

KEYWORDS: Magnetism, Solar processes, Space telescopes, Coronagraphy, Telescopes, Spectroscopy, Extreme ultraviolet, Sun, Solar energy, Wind energy

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Proceedings Article | 13 June 2006 Paper

The extreme UV imaging spectrometer for the JAXA Solar-B mission

J. Culhane, G. Doschek, T. Watanabe, A. Smith, C. Brown, H. Hara, L. Harra, A. James, K. al Janabi, B. Kent, C. Korendyke, J. Lang, J. Mariska, S. Myers, J. Seely, G. Simnett, J. Tandy, R. Thomas, D. Windt

Proceedings Volume 6266, 62660T (2006) https://doi.org/10.1117/12.671262

KEYWORDS: Iron, Photons, Mirrors, Raster graphics, Spectroscopy, Charge-coupled devices, Plasma, Calibration, Space operations, Sun

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Proceedings Article | 18 December 2000 Paper

Extreme-ultraviolet imaging spectrometer designed for the Japanese Solar-B satellite

J. Leonard Culhane, Clarence Korendyke, Tetsuya Watanabe, George Doschek

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410529

KEYWORDS: Spectroscopy, Extreme ultraviolet, Electrophoretic light scattering, Iron, Magnetism, Sun, Plasma, Telescopes, Charge-coupled devices, Spatial resolution

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The Extreme-ultraviolet Imaging Spectrometer combines, for the first time, high spectral, spatial and temporal resolution in a satellite based, solar extreme ultraviolet instrument. The instrument optical design consists of a multilayer-coated off- axis paraboloid mirror telescope followed by a toroidal grating spectrometer. The instrument includes thin film aluminum filters to reject longer wavelength solar radiation and employs CCD detectors at the focal plane. The telescope mirror is articulated to allow sampling of a large fraction of the solar surface from a single spacecraft pointing position. Monochromatic images are obtained either by rastering the solar image across the narrow entrance slit or by using a wide slit or slot in place of the slit. Monochromatic images of the region centered on the slot are obtained in a single exposure. Half of each optic is coated to maximize reflectance at 195 angstrom; the other half is coated to maximize reflectance at 270 angstrom. The two EUV wavelength bands were selected to optimize spectroscopic plasma diagnostic capabilities. Particular care was taken to choose wavelength ranges with relatively bright emission lines to obtain precision line of sight and turbulent bulk plasma velocity measurements from observed line profiles. The EIS spectral range contains emission lines formed over a temperature range from approximately 10⁵ - 10⁷ K. The wavelength coverage also includes several density sensitive emission line pairs. These line pairs provide spatial resolution independent density diagnostics at nominal coronal temperatures and densities. Each wavelength band is imaged onto a separate CCD detector. The main EIS instrument characteristics are: wavelength bands -- 180 - 204 angstrom and 250 - 290 angstrom; spectral resolution -- 0.0223 angstrom/pixel (23 - 34 km/second-pixel); slit dimensions -- 4 slits: 1 X 1024 arc- seconds and 50 X 1024 arc-seconds with two positions unspecified as of this writing; fine raster range -- >6 arc-minutes on the sun; coarse raster range -- > 1600 arc- seconds on the sun; largest spatial field of view in a single exposure -- 50 X 1024 arc-seconds; nominal time resolution for active region velocity studies -- 3.4s. The Solar-B satellite is scheduled for launch in August 2005 into a nominal 600 km sun-synchronous orbit.

Proceedings Article | 16 December 1998 Paper

Linear, macrocyclic, and hyperbranched polymers for electroluminescent applications

Xu Tang Tao, Yadong Zhang, Shinichiro Maruyama, Tatsuo Wada, Hiroyuki Sasabe, H. Suzuki, Tetsuya Watanabe, Seizo Miyata

Proceedings Volume 3476, (1998) https://doi.org/10.1117/12.332622

KEYWORDS: Polymers, Electroluminescence, Light emitting diodes, Absorption, Ionization, Glasses, Luminescence, Molecules, Thin films, External quantum efficiency

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