Measurement of Transverse Velocity Field of NVST Solar High Resolution Image

Liu Hui; Yang Yunfei; Shang Zhenhong; Li Runxin

Astronomical Research and Technology > 2018 > 15(2): 151-157.

Liu Hui, Yang Yunfei, Shang Zhenhong, Li Runxin. Measurement of Transverse Velocity Field of NVST Solar High Resolution Image[J]. Astronomical Research and Technology, 2018, 15(2): 151-157.

Citation:

Liu Hui, Yang Yunfei, Shang Zhenhong, Li Runxin. Measurement of Transverse Velocity Field of NVST Solar High Resolution Image[J]. Astronomical Research and Technology, 2018, 15(2): 151-157.

Citation:

Liu Hui, Yang Yunfei, Shang Zhenhong, Li Runxin. Measurement of Transverse Velocity Field of NVST Solar High Resolution Image[J]. Astronomical Research and Technology, 2018, 15(2): 151-157.

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Measurement of Transverse Velocity Field of NVST Solar High Resolution Image

1. Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China;
2. Key Laboratory of Application of Computer Technology of the Yunnan Provence, Kunming University of Science and Technology, Kunming 650500, China

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Received Date: January 01, 2018
Revised Date: January 04, 2018
Available Online: November 20, 2023

Graphical Abstract

Abstract

Abstract

The measurement of the transverse velocity field in the high resolution image of the Sun has been widely used in the dynamic analysis of the surface characteristics of the Chromosphere and Photosphere, however, the problem of insufficient measurement accuracy still exists. In this paper, the Demons method is introduced in detail and applied to the high resolution observation data processing of one meter vacuum solar telescope (NVST) in China. First, we select three data sets representing different bands of light and color balls at different observational intervals as test samples. When the velocity field is measured, the measurement accuracy of the velocity field is evaluated by the non-rigid registration with the image of previous time and the comparison of the structural similarity (SSIM). Experimental results show that Demons method is superior to traditional FLCT and Dave methods in the fine measurement of small scale motion, and the experimental results of sub-pixel and hyper-pixel analog displacements using Photosphere and Chromosphere image show that the point measurement accuracy can reach 0.1 pixel magnitude by our method.
- Solar high-resolution image,
- Velocity field,
- Optical flow field,
- Demons registration

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References (16)

References

[1]	Tsuneta S, Ichimoto K, Katsukawa Y, et al. The Solar Optical Telescope for the Hinode mission:an overview[J]. Solar Physics, 2008, 249(2):167-196.
[2]	Liu Z, Xu J, Gu B Z, et al. New vacuum solar telescope and observations with high resolution[J]. Research in Astronomy and Astrophysics, 2014, 14(6):705-718.
[3]	Goode P R, Denker C J, Didkovsky L I, et al. 1.6 M solar telescope in Big Bear-the NST[J]. Journal of the Korean Astronomical Society, 2003, 36(S1):S125-S133.
[4]	Scharmer G B, Bjelksjo K, Korhonen T K, et al. The 1-meter Swedish solar telescope[C]//Proceedings of SPIE. 2002:341-350.
[5]	汪景琇, 季海生. 空间天气驱动源-太阳风暴研究[J]. 中国科学:地球科学, 2013, 43(6):883-911. Wang Jingxiu, Ji Haisheng. Space weather driving Source-solar storm research[J]. Scientia Sinica Terrae, 2013, 43(6):883-911.
[6]	November L J, Simon G W. Precise proper-motion measurement of solar granulation[J]. The Astrophysical Journal, 1988, 333:427-442.
[7]	Fisher G H, Welsch B T. FLCT:a fast, efficient method for performing local correlation tracking[C]//Subsurface and Atmospheric Influences on Solar Activity ASP Conference Series. 2008:383.
[8]	Schuck P W. Local correlation tracking and the magnetic induction equation[J]. The Astrophysical Journal, 2005, 632(1):L53-L56.
[9]	Schuck P W, Chen J. Tracking magnetic footpoints with the magnetic induction equation[J]. The Astrophysical Journal, 2006, 646(2):1358-1391.
[10]	Wang S, Liu C, Deng N, et al. Sudden photospheric motion and sunspot rotation associated with the X2.2 flare on 2011 February 15[J]. Astrophysical Journal Letters, 2014, 782(2):L31-L36.
[11]	Liu C, Xu Y, Cao W, et al. Flare differentially rotates sunspot on Sun's surface[J]. Nature Communications, 2016, 7:13104.
[12]	Potts H E, Barrett R K, Diver D A. Balltracking:an highly efficient method for tracking flow fields[J]. Astronomy & Astrophysics, 2004, 424(1):253-262.
[13]	Potts H E, Diver D A. Automatic recognition and characterisation of supergranular cells from photospheric velocity fields[J]. Solar Physics, 2008, 248(2):263-275.
[14]	Thirion J P. Image matching as a diffusion process:an analogy with Maxwell's demons[J]. Medical Image Analysis, 1998, 2(3):243-260.
[15]	Kroon D J, Slump C H. MRI modality transformation in demon registration[C]//Proceedings of the IEEE International Symposium on Biomedical Imaging. 2009:963-966.
[16]	Wang Z, Bovik A C, Sheikh H R, et al. Image quality assessment:from error visibility to structural similarity[J]. IEEE Transactions on Image Processing, 2004, 13(4):600-612.