On the technologies of Hα imaging spectrograph for the CHASE mission

Liu, Qiang; Tao, Hong-Jiang; Chen, Changzheng; Han, Chengshan; Chen, Zhe; Mei, Gui; Yang, Liang; Hu, Qinglong; Xin, Hongwei; Li, Xiansheng; Guan, Hongtao; Xue, Desheng; Zhu, Mingqing; Hu, Changhong; Ha, Qinghua; He, Yukun; Fang, Cheng; Li, Chuan; Li, Zhen

doi:10.1007/s11433-022-1917-1

Cited by 21 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Hα Imaging Spectrograph (HIS) onboard the CHASE mission has made the first seeing-free spectroscopic observations of the whole solar disk at the passbands of 6559.7 -6565.9 Å and 6567.8 -6570.6 Å using a scanning technique [7,8,33]. the chromosphere simultaneously.…”

Section: Resultsmentioning

confidence: 99%

Height-dependent differential rotation of the solar atmosphere determined by the CHASE spectroscopic observation

ShiHao

Fang

et al. 2023

Preprint

View full text Add to dashboard Cite

Rotation is an intrinsic property of the stars including the Sun. Studying how stars rotate is essential for modeling their structure, formation and evolution [1, 2], and understanding their interaction with interplanetary environment [3, 4]. The Sun is a unique candidate that we can observe in detail and explore its rotation from the interior to the atmosphere [5, 6]. To date, we still do not know exactly how the Sun rotate depending on the latitude and altitude. The Chinese Hα Solar Explorer (CHASE) [7], the first space-based solar telescope of China, answers the question to a certain extent. The CHASE mission provides seeing-free spectroscopic observations of the whole solar disk at the wavebands of Si I (6560.58 Å), Fe I (6569.21 Å), and Hα (6562.81 Å) with a very high spectral resolution, which facilitates us to derive simultaneously the precise photospheric and chromospheric Dopplergrams [8]. It is found that the Sun rotates faster at higher surface layers from the photosphere to the chromosphere. The equatorial rotation rate is calculated to be 2.79 ± 0.01 μrad s−1 at the bottom of the photosphere, 2.83 ± 0.01 μrad s−1 at the middle photosphere, and 3.07 ± 0.02 μrad s−1 at the upper chromosphere. The ubiquitous frozen-in-plasma magnetic field probably plays the key role in producing the abnormal rotation rates of the solar atmosphere. The results have important implications for the solar dynamo processes and solar atmospheric heating problems.

show abstract

Section: Resultsmentioning

confidence: 99%

Height-dependent differential rotation of the solar atmosphere determined by the CHASE spectroscopic observation

ShiHao

Fang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The point accuracy and stability can be further tested by the full-Sun photospheric images obtained using the HIS onboard the CHASE mission [19]. Figure 13 shows a sample image observed at 02:02:20 UT on November 25 and the centroids of a series of images observed from 02:02:20 UT to 02:04:00 UT.…”

Section: Resultsmentioning

confidence: 99%

Levitated-body ultra-high pointing accuracy and stability satellite platform of the CHASE mission

Zhang

Cheng

You

et al. 2022

Sci. China Phys. Mech. Astron.

Self Cite

View full text Add to dashboard Cite

The CHASE satellite is designed based on the novel ultra-high pointing accuracy and stability levitated-body satellite platform, which breaks the traditional idea of rigidly connecting the satellite platform and payload. When operating in orbit, the platform and payload are non-connected and spatially levitated. By separately arranging the "noisy" and "quiet" devices, the complicated influence of platform vibration on the payload pointing direction is effectively avoided. Using the novel master-slave collaborative control method, the pointing accuracy and stability of the payload are improved considerably. In this paper, the basic principles, overall scheme, control method, and engineering implementation of a levitated-body satellite platform are discussed. Combined with the CHASE mission in-orbit data, the actual attitude pointing precision and stability of a levitated-body satellite platform are analyzed and evaluated.

show abstract

“…CHASE, launched on 2021 October 14, is the first solar space mission of the China National Space Administration (CNSA). The Hα Imaging Spectrograph (HIS; Liu et al 2022) is the scientific payload of CHASE and can provide spectroscopic observations of the Sun by scanning the full solar disk in both the Hα (6559.7-6565.9 Å) and Fe I (6567.8-6570.6 Å) wave bands. The CHASE/HIS data applied here have been calibrated through dark-field, flat-field, and slit image curvature corrections, wavelength and intensity calibration, and coordinate transformation (Qiu et al 2022).…”

Section: Observations and Data Analysismentioning

confidence: 99%

Partial Eruption of Solar Filaments. I. Configuration and Formation of Double-decker Filaments

Hou,

Li,

et al. 2023

ApJ

Self Cite

View full text Add to dashboard Cite

Partial eruptions of solar filaments are the typical representatives of solar eruptive behavior diversity. Here we investigate a typical filament partial eruption event and present integrated evidence for the configuration of the pre-eruption filament and its formation. The Chinese Hα Solar Explorer Hα observations reveal a structured Doppler velocity distribution within the pre-eruption filament, where distinct redshift only appeared in the eastern narrow part of the southern filament region and then disappeared after the partial eruption, while the northern part dominated by blueshift remained. Combining the Solar Dynamics Observatory and Advanced Space-based Solar Observatory observations, together with nonlinear-force-free-field modeling results, we verify that there were two independent material flow systems within the preflare filament, whose magnetic topology is a special double-decker configuration consisting of two magnetic flux ropes (MFRs) with opposite magnetic twist. During the formation of this filament system, continuous magnetic flux cancellation and footpoint motion were observed around its northern end. Therefore, we propose a new double-decker formation scenario: that the two MFRs composing such a double-decker configuration originated from two magnetic systems with different initial connections and opposite magnetic twist. Subsequent magnetic reconnection with the surrounding newly emerging fields resulted in the motion of the footpoint of the upper MFR to the region around the footpoint of the lower MFR, thus leading to the eventual formation of the double-decker configuration consisting of two MFRs with similar footpoints but opposite signs of magnetic twist. These results provide a potential way to determine unambiguously the progenitor configuration of a partially eruptive filament and reveal a special type of double-decker MFR configuration and a new double-decker formation scenario.

show abstract

On the technologies of Hα imaging spectrograph for the CHASE mission

Cited by 21 publications

References 26 publications

Height-dependent differential rotation of the solar atmosphere determined by the CHASE spectroscopic observation

Height-dependent differential rotation of the solar atmosphere determined by the CHASE spectroscopic observation

Levitated-body ultra-high pointing accuracy and stability satellite platform of the CHASE mission

Partial Eruption of Solar Filaments. I. Configuration and Formation of Double-decker Filaments

Contact Info

Product

Resources

About