First results of the Chinese Ha Solar Explorer - CHASE mission

The Chinese Hα Solar Explorer (CHASE) was successfully launched on 14 October 2021 as the first solar space mission of China National Space Administration (CNSA). The scientific payload of the CHASE satellite is the Hα Imaging Spectrograph (HIS). The CHASE/HIS acquires seeing-free spectroscopic observations of the whole solar disk at three spectral lines of Si I (6560.6 Å), Hα (6562.8 Å) and Fe I (6569.2 Å) which are formed at different heights of the photosphere and chromosphere. A full-Sun scanning takes only 46 seconds, with a spectral sampling of 0.024 Å and a spatial resolution of 1.2 arcsec. Since its launch and in-orbit calibrations, the performance of the CHASE mission is excellent and meets the pre-launch expectations. The FITS formatted science data are now available to the community through the Solar Science Data Center of Nanjing University (SSDC-NJU, https://ssdc.nju.edu.cn). Here we introduce the CHASE science data and the calibration procedures. The first series of scientific studies of the CHASE mission are also presented.