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| 1 | Advances in BeiDou Navigation Satellite System(BDS)and satellite navigation augmentation technologies显示文摘Several noteworthy breakthroughs have been made with the BeiDou Navigation Satellite System(BDS)and other global navigation satellite systems as well as the associated augmentation systems,such as the commissioning of the BDS-3 preliminary system and the successful launch of the first BDS-3 GEO satellite which carries the satellite-based augmentation payload.Presently,BDS can provide basic services globally,and its augmentation system is also being tested.This paper gives an overview of BDS and satellite navigation augmentation technologies.This overview is divided into four parts,which include the system segment technologies,satellite segment technologies,propagation segment technologies,and user segment technologies.In each part,these technologies are described from the perspectives of preliminary information,research progress,and summary.Moreover,the significance and progress of the BeiDou Satellite-based Augmentation System(BDSBAS),low earth orbit augmentation,and the national BeiDou ground-based augmentation system are presented,along with the airborne-based augmentation system.Furthermore,the conclusions and discussions covering popular topics for research,frontiers in research and development,achievements,and suggestions are listed for future research. | Rui Li Shuaiyong Zheng Ershen Wang Jinping Chen Shaojun Feng Dun Wang Liwen Dai | 2020 | Satellite Navigation2020，1，1： | 9 |
| 2 | Correction to: Advances in BeiDou Navigation Satellite System (BDS) and satellite navigation augmentation technologies显示文摘Correction to:Satell Navig(2020)1:12 https://doi.org/10.1186/s43020-020-00010-2 In the original publication of this article(Li et al.2020),there are several corrections as below:1.In the first paragraph of this article,the sentence“In recent years,China has been actively promoting the con-struction and development of the BeiDou Navigation Sat-ellite System(BDS),and by the end of the year 2000 the construction of BDS-1 was complete and BDS-1 began to provide GPS services for China.”should be changed into“In recent years,China has been actively promoting the construction and development of the BeiDou Navigation Satellite System(BDS),and by the end of the year 2000 the construction of BDS-1 was completed and BDS-1 began to provide services for China.”The word“GPS”should be removed. | Rui Li Shuaiyong Zheng Ershen Wang Jinping Chen Shaojun Feng Dun Wang Liwen Dai | 2020 | Satellite Navigation2020，1，1： | 3 |
| 3 | A Computation on Velocity Field of the Post-flare Loop System of August 17, 1989显示文摘The observational line of sight velocity fields of a large post flare loop(PFL) system on August 17,1989 were derived based on “multi cloud model” (MCM) method from the Hβ spectral data obtained with the two dimensional Multi Waveband Spectra Spectro Helio Graph (MW SSHG) at Yunnan Observatory. In order to explain the fundamental features of the velocity fields observed,an assumption and approximation to be taken into account that the matter within a loop system rises up from the loop foot to the loop top along the loop leg in a helical magnetic line under the combined action of solar gravity, magnetic stress and a gradient of atmospheric pressure in the loop system, and a theoretical velocity field of the loop system was calcuated with the aid of MHD theory. From a comparison of both velocity fields, it is found that the computed velocity field is basically similar with the observed one. It indicates that the assumption and approximation mentioned above are suitable basically. | Gu Xiaoma 1,2 , Dun Jinping 1, Zhong Shuhua 1 1 (Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China) 2 (United Laboratory of Optical Astronomy, The Chinese Academy of Sciences) (e mail:ssg@public. km. yn. cn) | 1999 | 天文研究与技术1999，，S1： | 1 |
| 4 | Observation and Research on the Twisting Characteristics of Flare Loop System显示文摘We analyze the evolution of Hβ monochromatic images and Hβ velocity fields of the flare loops system on June 4, 1991. It is the first time to demonstrate directly the dynamic process of the energy storage, transportation and release of the twisting magnetic fields in the flare process. | Li Rufeng, Bi Shaolan, Dun Jinping (Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China)$$$$ | 1999 | 天文研究与技术1999，，S1： | 0 |
| 5 | A New Post-hoc Flat Field Measurement Method for the Solar X-Ray and Extreme Ultraviolet Imager Onboard the FengYun-3E Satellite显示文摘Extreme ultraviolet(EUV)observations are widely used in solar activity research and space weather forecasting since they can observe both the solar eruptions and the source regions of the solar wind.Flat field processing is indispensable to remove the instrumental non-uniformity of a solar EUV imager in producing high-quality scientific data from original observed data.FengYun-3E(FY-3E)is a meteorological satellite operated in a Sunsynchronous orbit,and the routine EUV imaging data from the Solar X-ray and Extreme Ultraviolet Imager(X-EUVI)onboard FY-3E has the characteristic of concentric rotation.Taking advantage of the concentric rotation,we propose a post-hoc flat field measurement method for its EUV 195A channel in this paper.This method removes the small-scale and time-varying component of coronal activities by taking the median value for each pixel along the time axis of a concentric rotation data cube,and then derives the large-scale and invariable component of the quiet coronal radiation,and finally generates a flat field image.The flat field can be generated with cadences from hundreds of minutes(one orbit)to several days.Higher flat field accuracy can be achieved by employing more data.Further analysis shows that our method is able to measure the instrumental spot-like nonuniformity possibly caused by contamination on the detector,which mostly disappears after the in-orbit selfcleaning process.It can also measure the quasi-periodic grid-like non-uniformity,possibly from the obscuration of the support mesh on the rear filter.After flat field correction,these instrumental non-uniformities from the original data are effectively removed.Moreover,the X-EUVI 195A data after dark and flat field corrections are consistent with the 193A imaging data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,verifying the suitability of the method.The post-hoc method does not occupy observation time,which is advantageous for space weather operations.Our method is not only suitable for FY-3E/X-EUVI but also a candidate method for the flat field measurement of future solar EUV telescopes. | Qiao Song Xianyong Bai Bo Chen Xiuqing Hu Yajie Chen Zhenyong Hou Xiaofan Zhang Lingping He Kefei Song Peng Zhang Jing-Song Wang Xiaoxin Zhang Weiguo Zong Jinping Dun Hui Tian Yuanyong Deng | 2022 | Research in Astronomy and Astrophysics2022，22，10： | 0 |
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