Introduction to the Chinese Hα Solar Explorer (CHASE) Mission
doi: 10.11728/cjss2022.04.yg05
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Abstract: The Chinese Hα Solar Explorer (CHASE) mission, dubbed as “Xihe”—Goddess of the Sun, was launched on 14 October 2021 as the first solar space mission of China National Space Administration (CNSA). The CHASE mission aims to test an ultra-high precision and stability platform, and to acquire solar Hα Spectroscopic observations with high temporal and spectral resolutions. Since its launch, the in-orbit performance of the scientific payload—Hα Imaging Spectrograph (HIS) has been excellent. The first set of data has been calibrated and analyzed recently. The CHASE science data are expected to advance our understanding of the plasma dynamics in the solar lower atmosphere, and to investigate the Sun as a star for stellar physics.
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Key words:
- Space-based telescope /
- Solar physics /
- Solar activities
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Figure 2. Raw RSM spectrum observed at 06:01:27 UT on 22 December 2021, and the calibrated Level 1 RSM spectrum
Figure 3. Comparison between the calibrated spectral profiles and the ones from BASS2000
Table 1. Key parameters of CHASE/HIS
Parameter Value Primary aperture 180 mm Effective focal length 1820 mm Field of view 40′×40′ RSM Passbands 6559.7–6565.9 Å
6567.8–6570.6 ÅInstrument FWHM 0.072 Å Pixel spectral resolution 0.024 Å Pixel spatial resolution 0.52″ Scanning time 30–60 s Exposure time <10 ms Quantization (ADC) 12 bit CIM Center wavelength 6689 Å Passband FWHM 13.4 Å Pixel spatial resolution 0.52″ Exposure time <5 ms Frame rate 1 s Quantization (ADC) 10 bit 
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