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Tracking the photospheric horizontal velocity field with shallow U-net models

文献类型：期刊论文

作者Liu, Jiajia1,2; Xie, Quan1,2; Zhong, Cheng1,2; Ye, Yudong3; Wang, Yimin4; Ji KF(季凯帆)5; Wang, Yuming1,2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-06-20
卷号698
关键词Sun: atmosphere Sun: general Sun: photosphere
ISSN号0004-6361
DOI10.1051/0004-6361/202453627
产权排序第5完成单位
文献子类Article
英文摘要Context. Understanding the horizontal velocity field of the highly magnetized plasma within the solar atmosphere is essential to understanding the complicated dynamics and energy evolution of solar phenomena at various scales, from small-scale swirls to coronal mass ejections. Most traditional methods estimate the photospheric horizontal velocity field by tracking bright features. These reconstructed velocity fields may differ from the ground truth because the photosphere is not a single layer but has a depth of similar to 500 km. The observed bright features are combined emissions from different heights in the photosphere. Aims. In this work, we aim to develop a series of models for tracking the photospheric horizontal velocity field with high accuracy from high-resolution observations using a modified shallow U-Net architecture and to evaluate the performance of different models. Methods. We used photospheric intensity, vertical magnetic field strength, and horizontal velocity fields from a realistic 3D radiative numerical simulation of a quiet-Sun region generated using the Bifrost code to train and validate the shallow U-Net models. We built three shallow U-Net models: an intensity model using photospheric intensity as the input, a magnetic model using vertical magnetic field strength as the input, and a hybrid model combining both. Results. All three models yield good performances, among which the hybrid model shows the best performance with a correlation coefficient of 0.85 with the ground-truth velocity field. Comparisons with the Fourier local correlation tracking (FLCT) and the DeepVel methods demonstrate the superiority of the shallow U-Net models. Based on the research of this work, we have released a software named SUVEL for public use to extract photospheric horizontal velocity fields from high-resolution observations. SUVEL is only designed to be used on photospheric observations in the quiet-Sun regions with high temporal (best at 10 s, preferably less than 50 s) and high spatial resolutions.
学科主题天文学 ; 太阳与太阳系
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词MAGNETIC-FLUX ROPE ; SOLAR-TELESCOPE ; VORTEX FLOWS ; MOTIONS ; SUNSPOT ; ROTATION ; DRIVEN ; MAGNETOGRAMS ; SIMULATIONS ; FILAMENTS
资助项目Chinese Academy of Science[NSFC 12373056]; National Natural Science Foundation[XDB0560000]; Strategic Priority Research Program of the Chinese Academy of Science[NSFC 12303103]; National Natural Science Foundation of China
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001512479700017
出版者EDP SCIENCES S A
资助机构Chinese Academy of Science[NSFC 12373056] ; National Natural Science Foundation[XDB0560000] ; Strategic Priority Research Program of the Chinese Academy of Science[NSFC 12303103] ; National Natural Science Foundation of China
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28378]  
专题天文技术实验室
通讯作者Liu, Jiajia
作者单位1.National Key Laboratory of Deep Space Exploration, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
2.CAS Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment/Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei 230026, China;
3.Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, China;
4.School of Data Science, Qingdao University of Science and Technology, Qingdao 266061, China;
5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
推荐引用方式
GB/T 7714		 Liu, Jiajia,Xie, Quan,Zhong, Cheng,et al. Tracking the photospheric horizontal velocity field with shallow U-net models[J]. ASTRONOMY & ASTROPHYSICS,2025,698.
APA Liu, Jiajia.,Xie, Quan.,Zhong, Cheng.,Ye, Yudong.,Wang, Yimin.,...&Wang, Yuming.(2025).Tracking the photospheric horizontal velocity field with shallow U-net models.ASTRONOMY & ASTROPHYSICS,698.
MLA Liu, Jiajia,et al."Tracking the photospheric horizontal velocity field with shallow U-net models".ASTRONOMY & ASTROPHYSICS 698(2025).

入库方式： OAI收割

来源：云南天文台

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