中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Wide field-of-view, high-resolution Solar observation in combination with ground layer adaptive optics and speckle imaging

文献类型:期刊论文

作者Zhong, Libo2,3; Zhang, Lanqiang2,3; Shi, Zhendong1; Tian, Yu2,3; Guo, Youming2,3; Kong, Lin2,3; Rao, Xuejun2,3; Bao, Hua2,3; Zhu, Lei2,3; Rao, Changhui2,3
刊名ASTRONOMY & ASTROPHYSICS
出版日期2020-05-28
卷号637期号:A99页码:1-14
关键词Instrumentation: Adaptive Optics Instrumentation: High Angular Resolution Techniques: Image Processing Techniques: High Angular Resolution Sun: General
ISSN号0004-6361
DOI10.1051/0004-6361/201935109
文献子类期刊论文
英文摘要

Context. High angular resolution images at a wide field of view are required for investigating Solar physics and predicting space weather. Ground-based observations are often subject to adaptive optics (AO) correction and post-facto reconstruction techniques to improve the spatial resolution. The combination of ground layer adaptive optics (GLAO) and speckle imaging is appealing with regard to a simplification of the correction and the high resolution of the reconstruction. The speckle transfer functions (STFs) used in the speckle image reconstruction mainly determine the photometric accuracy of the recovered result. The STF model proposed by Friedrich Wöger and Oskar von der Lühe in the classical AO condition is generic enough to accommodate the GLAO condition if correct inputs are given. Thus, the precisely calculated inputs to the model STF are essential for the final results. The necessary input for the model STF is the correction efficiency which can be calculated simply with the assumption of one layer turbulence. The method for calculating the correction efficiency for the classical AO condition should also be improved to suit the GLAO condition. The generic average height of the turbulence layer used by Friedrich Wöger and Oskar von der Lühe in the classic AO correction may lead to reduced accuracy and should be revised to improve photometric accuracy. Aims. This study is aimed at obtaining quantitative photometric reconstructed images in the GLAO condition. We propose methods for extracting the appropriate inputs for the STF model. Methods. In this paper, the telemetry data of the GLAO system was used to extract the correction efficiency and the equivalent height of the turbulence. To analyze the photometric accuracy of the method, the influence resulting from the distribution of the atmospheric turbulence profile and the extension of the guide stars are investigated by simulations. At those simulations, we computed the STF from the wavefront phases and convolved it with the high-resolution numerical simulations of the solar photosphere. We then deconvolved them with the model STF calculated from the correction efficiency and the equivalent height to obtain a reconstructed image. To compute the resulting photometric precision, we compared the intensity of the original image with the reconstructed image. We reconstructed the solar images taken by the GLAO prototype system at the New Vacuum Solar Telescope of the Yunnan Astronomical Observatory using this method and analyzed the results. Results. These simulations and ensuing analysis demonstrate that high photometric precision can be obtained for speckle amplitude reconstruction using the inputs for the model STF derived from the telemetry data of the GLAO system. © L. Zhong et al. 2020.

出版地LES ULIS CEDEX A
WOS关键词Reconstruction ; Contrast ; Images ; Long
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000538131300001
出版者EDP SCIENCES S A
源URL[http://ir.ioe.ac.cn/handle/181551/10044]  
专题光电技术研究所_自适应光学技术研究室(八室)
作者单位1.Southwest Institute of Technical Physics, Chengdu, Sichuan; 610041, China
2.Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, PO Box 350, Sichuan, Shuangliu, Chengdu; 610209, China;
3.Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, PO Box 350, Shuangliu, Chengdu, Sichuan; 610209, China;
推荐引用方式
GB/T 7714
Zhong, Libo,Zhang, Lanqiang,Shi, Zhendong,et al. Wide field-of-view, high-resolution Solar observation in combination with ground layer adaptive optics and speckle imaging[J]. ASTRONOMY & ASTROPHYSICS,2020,637(A99):1-14.
APA Zhong, Libo.,Zhang, Lanqiang.,Shi, Zhendong.,Tian, Yu.,Guo, Youming.,...&Rao, Changhui.(2020).Wide field-of-view, high-resolution Solar observation in combination with ground layer adaptive optics and speckle imaging.ASTRONOMY & ASTROPHYSICS,637(A99),1-14.
MLA Zhong, Libo,et al."Wide field-of-view, high-resolution Solar observation in combination with ground layer adaptive optics and speckle imaging".ASTRONOMY & ASTROPHYSICS 637.A99(2020):1-14.

入库方式: OAI收割

来源:光电技术研究所

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