17 September 2012 Chromospheric Lyman-alpha spectro-polarimeter (CLASP)
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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.
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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, "Chromospheric Lyman-alpha spectro-polarimeter (CLASP)", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84434F (17 September 2012); doi: 10.1117/12.925991; https://doi.org/10.1117/12.925991

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