Observation of sunspots at He I 10830Å using a low-noise InGaAs infrared detector

Bai-Cheng Sun; Yong-Sheng Xiang; Ming-Guo Fan; Xiao-Xia Gong; Bin Wang; Jie Guo; Fang-Yu Xu; Yong-Fang Luo

doi:10.1117/12.2664982

31 January 2023 Observation of sunspots at He I 10830Å using a low-noise InGaAs infrared detector

Bai-Cheng Sun, Yong-Sheng Xiang, Ming-Guo Fan, Xiao-Xia Gong, Bin Wang, Jie Guo, Fang-Yu Xu, Yong-Fang Luo

Proceedings Volume 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022); 1250508 (2023) https://doi.org/10.1117/12.2664982
Event: Earth and Space: From Infrared to Terahertz (ESIT 2022), 2022, Nantong, China

Abstract

The infrared spectra of the Sun include numerous absorption lines, among which He I 10830 Å is one of the most representative spectral lines in the near-infrared band formed in the high-temperature region of the upper chromosphere. The observation of the spectral lines is important for the solar physics research. In this paper, the monochromatic images of sunspots in the He I 10830 Å spectral line was obtained by the one-meter new vacuum solar telescope at the Fuxian Lake solar observation base. The infrared detector using the domestic InGaAs 640×512 focal plane array device can reach a low dark current of 62e-/s/pixel and readout noise of 25.4 e- at 78K by Stirling cooler. The laboratory tests and actual astronomical observations were completed. In the case of large detector readout noise and dark current, a method of extracting the observation target by effectively calculating the flat field was proposed. A monochromatic image of sunspots with He I 10830 Å is obtained for the first time in China using the self-developed detector.

Citation Download Citation

Bai-Cheng Sun, Yong-Sheng Xiang, Ming-Guo Fan, Xiao-Xia Gong, Bin Wang, Jie Guo, Fang-Yu Xu, and Yong-Fang Luo "Observation of sunspots at He I 10830Å using a low-noise InGaAs infrared detector", Proc. SPIE 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022), 1250508 (31 January 2023); https://doi.org/10.1117/12.2664982

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