Mapping Solar Magnetic Fields by Sounding Rocket Experiments CLASP2 and CLASP2.1

ISHIKAWA Ryohko (石川 遼子）
National Astronomical Observatory of Japan

The magnetic field measurements in the solar chromosphere and above are critical to understand the solar activities in the corona as well as in the chromosphere. To this end, we need to measure and model the polarization of ultraviolet (UV) spectral lines originating in the chromosphere, which encodes the information on the magnetic fields. The Chromospheric LAyer Spectro-Polarimeter (CLASP2) sounding rocket experiment was carried out on 2019 April 11, providing the first ever spectrally and spatially resolved Stokes profiles (intensity, linear polarization, and circular polarization) across the Mg II h & k lines at 280 nm. We demonstrated the presence of the scattering polarization and the operation of the Hanle and Magneto-Optical effects over the Mg II h & k lines. Moreover, through coordinated observations with the Solar Optical Telescope (SOT) aboard the Hinode satellite, we have shown how the magnetic fields expand with height in the chromosphere of the active region, coupling the different atmospheric layers. To further demonstrate the maturity of the UV spectropolarimetry techniques, on 2021 October 8, we re-flew the CLASP2 payload with a modified observing program to produce a multi-height, two-dimensional map of the chromospheric magnetic field as CLASP2.1. In this talk, we summarize the scientific results of the CLASP2 and CLASP2.1 and the perspectives for the future.

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