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Proceedings Paper

Overview of Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP)
Author(s): Noriyuki Narukage; Saku Tsuneta; Takamasa Bando; Ryouhei Kano; Masahito Kubo; Ryoko Ishikawa; Hirohisa Hara; Yoshinori Suematsu; Yukio Katsukawa; Hiroko Watanabe; Kiyoshi Ichimoto; Taro Sakao; Toshifumi Shimizu; Ken Kobayashi; Brian Robinson; Tony Kim; Amy Winebarger; Edward West; Jonathan Cirtain; Bart De Pontieu; Roberto Casini; Javier Trujillo Bueno; Jiri Stepan; Rafael Manso Sainz; Luca Belluzzi; Andres Asensio Ramos; Mats Carlsson
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Paper Abstract

The solar chromosphere is an important boundary, through which all of the plasma, magnetic fields and energy in the corona and solar wind are supplied. Since the Zeeman splitting is typically smaller than the Doppler line broadening in the chromosphere and transition region, it is not effective to explore weak magnetic fields. However, this is not the case for the Hanle effect, when we have an instrument with high polarization sensitivity (~ 0.1%). "Chromospheric Lyman- Alpha SpectroPolarimeter (CLASP)" is the sounding rocket experiment to detect linear polarization produced by the Hanle effect in Lyman-alpha line (121.567 nm) and to make the first direct measurement of magnetic fields in the upper chromosphere and lower transition region. To achieve the high sensitivity of ~ 0.1% within a rocket flight (5 minutes) in Lyman-alpha line, which is easily absorbed by materials, we design the optical system mainly with reflections. The CLASP consists of a classical Cassegrain telescope, a polarimeter and a spectrometer. The polarimeter consists of a rotating 1/2-wave plate and two reflecting polarization analyzers. One of the analyzer also works as a polarization beam splitter to give us two orthogonal linear polarizations simultaneously. The CLASP is planned to be launched in 2014 summer.

Paper Details

Date Published: 6 October 2011
PDF: 17 pages
Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 81480H (6 October 2011); doi: 10.1117/12.894290
Show Author Affiliations
Noriyuki Narukage, Japan Aerospace Exploration Agency (Japan)
Saku Tsuneta, National Astronomical Observatory of Japan (Japan)
Takamasa Bando, National Astronomical Observatory of Japan (Japan)
Ryouhei Kano, National Astronomical Observatory of Japan (Japan)
Masahito Kubo, National Astronomical Observatory of Japan (Japan)
Ryoko Ishikawa, National Astronomical Observatory of Japan (Japan)
Hirohisa Hara, National Astronomical Observatory of Japan (Japan)
Yoshinori Suematsu, National Astronomical Observatory of Japan (Japan)
Yukio Katsukawa, National Astronomical Observatory of Japan (Japan)
Hiroko Watanabe, Kwasan and Hida Observatories, Kyoto Univ. (Japan)
Kiyoshi Ichimoto, Kwasan and Hida Observatories, Kyoto Univ. (Japan)
Taro Sakao, Japan Aerospace Exploration Agency (Japan)
Toshifumi Shimizu, Japan Aerospace Exploration Agency (Japan)
Ken Kobayashi, The Univ. of Alabama in Huntsville (United States)
Brian Robinson, The Univ. of Alabama in Huntsville (United States)
Tony Kim, NASA Marshall Space Flight Ctr. (United States)
Amy Winebarger, NASA Marshall Space Flight Ctr. (United States)
Edward West, NASA Marshall Space Flight Ctr. (United States)
Jonathan Cirtain, NASA Marshall Space Flight Ctr. (United States)
Bart De Pontieu, Lockheed Martin Solar & Astrophysics Lab. (United States)
Roberto Casini, High Altitude Observatory, National Ctr. for Atmospheric Research (United States)
Javier Trujillo Bueno, Instituto de Astrofísica de Canarias (Spain)
Jiri Stepan, Instituto de Astrofísica de Canarias (Spain)
Rafael Manso Sainz, Instituto de Astrofísica de Canarias (Spain)
Luca Belluzzi, Instituto de Astrofísica de Canarias (Spain)
Andres Asensio Ramos, Instituto de Astrofísica de Canarias (Spain)
Mats Carlsson, Univ. of Oslo (Norway)


Published in SPIE Proceedings Vol. 8148:
Solar Physics and Space Weather Instrumentation IV
Silvano Fineschi; Judy Fennelly, Editor(s)

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