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Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP)

Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP) は太陽の彩層・遷移層 （彩層とコロナの間の薄い層）から放たれるライマンα線（水素原子が出す真空紫外線域・波長121.6 nm の輝線）を 偏光分光観測する装置で、観測ロケットを用いて宇宙空間に打ち上げ 観測を行います。この実験の目的は、ライマンα線の直線偏光を〜0.1% という高い精度で検出し、量子力学的ハンレ効果を用いて、 彩層・遷移層の磁場を直接計測することです。これは世界初の試みで、 CLASP は彩層・遷移層の磁場を計測するための新しい観測手法と技術の検証・確立を目指しています。

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The Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP) is a sounding rocket experiment for making precise measurement of the polarization profile of the Lyman-alpha line from the solar atmosphere. The Lyman-alpha line is an ultraviolet emission line (wavelength 121.6 nm), emitted high in the solar atmosphere, at the chromosphere and the transition region (located between the chromosphere and the corona). CLASP aims to make the first ever measurement of the Hanle effect polarization caused by the magnetic field in the chromosphere and transition region, and infer the magnetic field strength and orientation. It is a pathfinder experiment that aims to establish this technique as a measurement tool for chromospheric and transition-region magnetic fields.