[1] Haibin ZHAO, Qisheng LIN, Yiping CHEN et al. Coronal structure and brightness profile of the total solar eclipse on August 1, 2008. Chinese Science Bulletin, 54, 1790-1792(2009).

[2] B LYOT. The study of the solar corona and prominences without eclipses (George Darwin Lecture, 1939). Monthly Notices of the Royal Astronomical Society, 99, 580-594(1939).

[3] A LLEBARIA, P LAMY, J F DANJARD. Photometric calibration of the LASCO-C2 coronagraph for solar system objects. Icarus, 182, 281-296(2006).

[4] Yu LIU. The first coronagraph in China settled in Lijiang, Yunnan province. Amateur Astronomer, 1, 60-63(2014).

[5] M ZHAO, Y LIU, A ELMHAMDI et al. Conditions for coronal observations at the Lijiang observatory in 2011. Solar physics, 293, 1-13(2018).

[6] Xuefei ZHANG. Construction and research based on the first coronagraph station in China(2022).

[7] K ICHIMOTO, M NOGUCHI, N TANAKA et al. A new imaging system of the corona at Norikura. Publications of the Astronomical Society in Japan, 51, 383-391(1999).

[8] Xuefei ZHANG, Yu LIU, Mingyu ZHAO et al. Comparison of the coronal green-line intensities with the EUV measurements from SDO/AIA. Research in Astronomy and Astrophysics, 22, 075012(2022).

[9] Xuefei ZHANG, Yu LIU, Mingyu ZHAO et al. On the relation between coronal green line brightness and magnetic fields intensity. Research in Astronomy and Astrophysics, 22, 075007(2022).

[10] Zihan LI, Yu LIU, Xuefei ZHANG et al. Study of the intensity distribution of the green line in the inner corona. Acta Astronomica Sinica(2023). http://chinaxiv.org/abs/2023O5.00149

[11] P R SPYAK, W L WOLFE. Scatter from particulate-contaminated mirrors. part 3: theory and experiment for dust and lambda=10.6 μm. Optical Engineering, 31, 1764-1774(1992).

[12] R PETTIT, J FREESE. Wavelength dependent scattering caused by dust accumulation on solar mirrors. Solar Energy Materials, 3, 1-20(1980).

[13] R YOUNG. Low-scatter mirror degradation by particle contamination. Optical Engineering, 15, 516-520(1976).

[14] Yu LIU. Coronal magnetic fields inferred from IR wavelength and comparison with EUV observations. Annales Geophysicae, 27, 2771-2777(2009).

[15] Yu LIU, Haosheng LIN. Observational test of coronal magnetic field models. I. Comparison with potential field model. The Astrophysical Journal, 680, 1496(2008).

[16] Y LIU, H LIN, J KUHN. Coronal magnetic fields from the inversion of linear polarization measurements. Proceedings of the International Astronomical Union, 5, 96-98(2009).

[17] N OTSU. A threshold selection method from gray-level histograms. IEEE Transactions on Systems, Man, Cybernetics, 9, 62-66(1979).

[18] Zhong LIU, Yuanyong DENG, Dehua YANG et al. Chinese giant solar telescope. Scientia Sinica Physica, Mechanica & Astronomica, 49, 35-43(2019).