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Proceedings Paper

Chromospheric Lyman-alpha spectro-polarimeter (CLASP)
Author(s): Ryouhei Kano; Takamasa Bando; Noriyuki Narukage; Ryoko Ishikawa; Saku Tsuneta; Yukio Katsukawa; Masahito Kubo; Shin-nosuke Ishikawa; Hirohisa Hara; Toshifumi Shimizu; Yoshinori Suematsu; Kiyoshi Ichimoto; Taro Sakao; Motoshi Goto; Yoshiaki Kato; Shinsuke Imada; Ken Kobayashi; Todd Holloway; Amy Winebarger; Jonathan Cirtain; Bart De Pontieu; Roberto Casini; Javier Trujillo Bueno; Jiří Štĕpán; Rafael Manso Sainz; Luca Belluzzi; Andres Asensio Ramos; Frédéric Auchère; Mats Carlsson
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Paper Abstract

One of the biggest challenges in heliophysics is to decipher the magnetic structure of the solar chromosphere. The importance of measuring the chromospheric magnetic field is due to both the key role the chromosphere plays in energizing and structuring the outer solar atmosphere and the inability of extrapolation of photospheric fields to adequately describe this key boundary region. Over the last few years, significant progress has been made in the spectral line formation of UV lines as well as the MHD modeling of the solar atmosphere. It is found that the Hanle effect in the Lyman-alpha line (121.567 nm) is a most promising diagnostic tool for weaker magnetic fields in the chromosphere and transition region. Based on this groundbreaking research, we propose the Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) to NASA as a sounding rocket experiment, for making the first measurement of the linear polarization produced by scattering processes and the Hanle effect in the Lyman-alpha line (121.567 nm), and making the first exploration of the magnetic field in the upper chromosphere and transition region of the Sun. The CLASP instrument consists of a Cassegrain telescope, a rotating 1/2-wave plate, a dual-beam spectrograph assembly with a grating working as a beam splitter, and an identical pair of reflective polarization analyzers each equipped with a CCD camera. We propose to launch CLASP in December 2014.

Paper Details

Date Published: 17 September 2012
PDF: 17 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84434F (17 September 2012); doi: 10.1117/12.925991
Show Author Affiliations
Ryouhei Kano, National Astronomical Observatory of Japan (Japan)
Takamasa Bando, National Astronomical Observatory of Japan (Japan)
Noriyuki Narukage, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Ryoko Ishikawa, National Astronomical Observatory of Japan (Japan)
Saku Tsuneta, National Astronomical Observatory of Japan (Japan)
Yukio Katsukawa, National Astronomical Observatory of Japan (Japan)
Masahito Kubo, National Astronomical Observatory of Japan (Japan)
Shin-nosuke Ishikawa, National Astronomical Observatory of Japan (Japan)
Hirohisa Hara, National Astronomical Observatory of Japan (Japan)
Toshifumi Shimizu, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Yoshinori Suematsu, National Astronomical Observatory of Japan (Japan)
Kiyoshi Ichimoto, Kwasan and Hido Observatories, Kyoto Univ. (Japan)
Taro Sakao, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Motoshi Goto, National Institute for Fusion Science (Japan)
Yoshiaki Kato, National Astronomical Observatory of Japan (Japan)
Shinsuke Imada, National Astronomical Observatory of Japan (Japan)
Ken Kobayashi, The Univ. of Alabama in Huntsville (United States)
Todd Holloway, NASA Marshall Space Flight Ctr. (United States)
Amy Winebarger, NASA Marshall Space Flight Ctr. (United States)
Jonathan Cirtain, NASA Marshall Space Flight Ctr. (United States)
Bart De Pontieu, Lockheed Martin Solar and Astrophysics Lab. (United States)
Roberto Casini, National Ctr. for Atmospheric Research (United States)
Javier Trujillo Bueno, Instituto de Astrofísica de Canarias (Spain)
Jiří Štĕpán, Astronomical Institute of the ASCR, v.v.i. (Czech Republic)
Rafael Manso Sainz, Instituto de Astrofisica de Canarias (Spain)
Luca Belluzzi, Instituto de Astrofisica de Canarias (Spain)
Andres Asensio Ramos, Instituto de Astrofisica de Canarias (Spain)
Frédéric Auchère, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris-Sud 11 (France)
Mats Carlsson, Institute of Theoretical Astrophysics, Univ. of Oslo (Norway)


Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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