6 October 2011 Overview of Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP)
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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.
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Noriyuki Narukage, Noriyuki Narukage, Saku Tsuneta, Saku Tsuneta, Takamasa Bando, Takamasa Bando, Ryouhei Kano, Ryouhei Kano, Masahito Kubo, Masahito Kubo, Ryoko Ishikawa, Ryoko Ishikawa, Hirohisa Hara, Hirohisa Hara, Yoshinori Suematsu, Yoshinori Suematsu, Yukio Katsukawa, Yukio Katsukawa, Hiroko Watanabe, Hiroko Watanabe, Kiyoshi Ichimoto, Kiyoshi Ichimoto, Taro Sakao, Taro Sakao, Toshifumi Shimizu, Toshifumi Shimizu, Ken Kobayashi, Ken Kobayashi, Brian Robinson, Brian Robinson, Tony Kim, Tony Kim, Amy Winebarger, Amy Winebarger, Edward West, Edward West, Jonathan Cirtain, Jonathan Cirtain, Bart De Pontieu, Bart De Pontieu, Roberto Casini, Roberto Casini, Javier Trujillo Bueno, Javier Trujillo Bueno, Jiri Stepan, Jiri Stepan, Rafael Manso Sainz, Rafael Manso Sainz, Luca Belluzzi, Luca Belluzzi, Andres Asensio Ramos, Andres Asensio Ramos, Mats Carlsson, Mats Carlsson, } "Overview of Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP)", Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 81480H (6 October 2011); doi: 10.1117/12.894290; https://doi.org/10.1117/12.894290
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