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Science China Earth Sciences 2024年第8期67卷 2702-2704页

作者： jingxiu wang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Solar activities are closely related to human production and daily *** warm sunlight nurtures life on Earth,but the Sun also occasionally exhibits eruptive activities that significantly impact and threaten the Earth’s *** eruptive activities occur as large-scale energy release processes in localized regions of the solar atmosphere,primarily manifested through the enhanced electromagnetic radiation and energetic particle emissions in solar flares,as well as the ejection of mass and magnetic flux in coronal mass ejections(CMEs).

关键词： Solar Earth evolutionary

On the possibility of predicting flare index and CME velocity using vector magnetograms

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Science China(Physics,Mechanics & Astronomy) 2020年第6期63卷 117-126页

作者： AnQin Chen jingxiu wang Key Laboratory of Space Weather National Center for Space WeatherChina Meteorological AdministrationBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Solar Activity of Chinese Academy of Sciences National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China

In this paper,106 active regions(ARs)in the visible solar hemisphere in solar cycle 24 whose maximum sunspot groups’areas were larger than 400μh were *** association of their flare index(Iflare),largest flare magnitude(Mflare),and fastest coronal mass ejection(CME)velocity(VCME)with the vector magnetic field parameters were examined,and attempts were made to predict Iflare,Mflare,and VCME using the vector *** and Mflare were found to have a good correlation with the total photospheric free magnetic energy density(Efree),the length of the magnetic neutral line with a steep horizontal magnetic gradient(LNL),and the area with strong magnetic shear(Aψ).Iflare and Mflare were also found to have a best correlation with ***,VCME displayed a moderate correlation with these three magnetic field parameters with a best correlation with Aψ.Thus,Efree and Aψappear to be the best parameters that can be used to predict Iflare(Mflare)and VCME,***,the multiple linear regression fit is proposed more suitable to predict Iflare and Mflare because of the stronger forecasts obtained than those by the linear fit with one magnetic field parameter for Iflare and ***,the VCME forecasts are better obtained through the linear fit with Aψ.The majority of the ARs without any CMEs never produced any flare larger than X1.0 while having a relatively lower Efree,shorter LNL,and smaller Aψ.This suggests that the larger the largest flare in an AR is,the faster the fastest CME produced by the AR will be.

关键词： sunspots magnetic field flare coronal mass ejection

Solar activity studies:From a magnetohydrodynamics description to a plasma perspective

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Chinese Science Bulletin 2012年第12期57卷 1362-1368页

作者： wang jingxiu Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

Solar activity,in which there is an explosive release of magnetic energy in the solar atmosphere,is one of the most spectacular manifestations of space plasma ***-potential,free magnetic energy is accumulated by the interaction between plasma and magnetic fields in the photosphere and sub-photospheric *** the photosphere and lower solar atmosphere,plasma is only partially ionized and there is three-species(or three-fluid)*** conductivity should therefore be considered in explaining solar *** the other hand,the explosive release of magnetic energy is believed to be caused by magnetic reconnection in the corona,where plasma is fully ionized and essentially ***,for collisionless plasma,we seem to have no precise quantitative description or formulation of its *** physically understand magnetic reconnection in collisionless plasma is an important task in making further progress in solar activity *** article discusses the plasma perspective of solar activity *** discussion begins with solar observations,and then,an analysis of the plasma problems that we face and need to better understand.

关键词：空间等离子体太阳活动碰撞等离子体磁场能量太阳大气太阳观测有效电导率相互作用

Periodicities in photospheric magnetic flux

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Science China(Physics,Mechanics & Astronomy) 2006年第2期49卷 246-256页

作者： SONG Wenbin wang jingxiu National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

Magnetic field plays an important role in solar structure and activity. In prin-ciple, the determination of magnetic flux would provide the best general-purpose index of solar activity. Currently, the periodicity studies corresponding to photospheric magnetic flux (PMF) are very few possibly due to the absence of a uniform flux sequence. In this paper, by using 383 NSO/Kitt Peak magnetic synoptic charts we reconstruct a flux se-quence from February 1975 to August 2003 and perform a relatively systemic periodicity analysis with two methods of the Scargle periodogram and the Morlet wavelet transform. As a result, four periods are found at around 1050, 500, 300 and 160 days. We analyze these periods’ temporal variabilities in detail and discuss their respective origins briefly.

关键词： solar magnetic fields solar activity solar photosphere.

Preface: Frontiers in Astrophysics(Ⅱ)——A special issue dedicated to the 20th anniversary of RAA(2001–2020)

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Research in Astronomy and Astrophysics 2020年第10期20卷 157-159页

作者： jingxiu wang Wing-Huen Ip University of Chinese Academy of Sciences Beijing 100049 National Astronomical Observatories Chinese Academy of SciencesBeijing 100101 Institute of Astronomy “National”Central UniversityZhongliTaoyuan 32049

On the arrival of the 20 th anniversary of the journal,Research in Astronomy and Astrophysics(RAA),we see rapid progress in the frontiers of astronomy and *** celebrate the birth and growth of RAA,a special issue consisting of 11 invited reviews from more than 30 authors,mainly from China,has been *** is the second volume of the special issues entitled Frontiers in Astrophysics published in *** publication aims at evaluating the current status and key progress in some frontier areas of astronomy and astrophysics with a spirit of guiding future studies.

关键词： galaxies:statistics Galaxy:structure stars:binaries,black holes planetary systems Sun:CMEs,filaments,magnetic fields astronomical instrumentation,methods and techniques

Cluster of solar active regions and onset of coronal mass ejections

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Science China(Physics,Mechanics & Astronomy) 2015年第9期58卷 95-102页

作者： wang jingxiu ZHANG YuZong HE Han CHEN AnQin JIN ChunLan ZHOU GuiPing Key Lab of Solar Activity National Astronomical Observatories Chinese Academy of Sciences National Center for Space Weather China Meteorological Administration

round-the-clock solar observations with full-disk coverage of vector magnetograms and multi-wavelength images demonstrate that solar active regions(ARs) are ultimately connected with magnetic field. Often two or more ARs are clustered, creating a favorable magnetic environment for the onset of coronal mass ejections(CMEs). In this work, we describe a new type of magnetic complex: cluster of solar ARs. An AR cluster is referred to as the close connection of two or more ARs which are located in nearly the same latitude and a narrow span of longitude. We illustrate three examples of AR clusters, each of which has two ARs connected and formed a common dome of magnetic flux system. They are clusters of NOAA(i.e., National Oceanic and Atmospheric Administration) ARs 11226 & 11227, 11429 & 11430, and 11525 & 11524. In these AR clusters, CME initiations were often tied to the instability of the magnetic structures connecting two partner ARs, in the form of inter-connecting loops and/or channeling filaments between the two ARs. We show the evidence that, at least, some of the flare/CMEs in an AR cluster are not a phenomenon of a single AR, but the result of magnetic interaction in the whole AR cluster. The observations shed new light on understanding the mechanism(s) of solar activity. Instead of the simple bipolar topology as suggested by the so-called standard flare model, a multi-bipolar magnetic topology is more common to host the violent solar activity in solar atmosphere.

关键词： activity coronal mass ejection magnetic fields

Fundamental Understanding on Selenium Electrochemistry:From Electrolytic Cell to Advanced Energy Storage

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Energy & Environmental Materials 2024年第3期7卷 236-256页

作者： Jiguo Tu Cheng Chang jingxiu wang Haiping Lei R.Vasant Kumar Mingyong wang Shuqiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Selenium(Se),as an important quasi-metal element,has attracted much attention in the fields of thin-film solar cells,electrocatalysts and energy storage applications,due to its unique physical and chemical ***,the electrochemical behavior of Se in different systems from electrolytic cell to battery are complex and not fully *** this article,we focus on the electrochemical processes of Se in aqueous solutions,molten salts and ionic liquid electrolytes,as well as the application of Se-containing materials in energy ***,the electrochemical behaviors of Se-containing species in different systems are comprehensively summarized to understand the complexity of the kinetic processes and guide the Se ***,the relationship between the deposition conditions and resulting structure and morphology of electrodeposited Se is discussed,so as to regulate the morphology and composition of the ***,the advanced energy storage applications of Se in thin-film solar cells and secondary batteries are reviewed,and the electrochemical reaction processes of Se are systematically comprehended in monovalent and multivalent metal-ion *** on understanding the fundamental electrochemistry mechanism,the future development directions of Se-containing materials are considered in view of the in-depth review of reaction kinetics and energy storage applications.

关键词： electrochemical behaviors electrodeposition electrolytes energy storage selenium

Recent studies in satellite observations of three-dimensional magnetic reconnection

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Science China(Technological Sciences) 2007年第3期50卷 380-384页

作者： XIAO ChiJie wang XiaoGang PU ZuYin MA ZhiWei ZHAO Hui ZHOU GuiPing wang jingxiu LIU ZhenXing National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China School of Physics Peking UniversityBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310027China Center for Space Science and Applied Research Chinese Academy of SciencesBeijing 100080China

Magnetic reconnection is a main process converting the magnetic energy into thermal and kinetic energy in plasmas. It is one of the fundamental problems of crucial importance not only to space plasmas physics and space weather studies,such as the solar flare,coronal mass ejections and magnetospheric substorms,but also to the stability analysis in magnetically confined fusion. In general,except for cases with periodical boundary conditions,three-dimensional(3D) magnetic re-connection occurs on magnetic separatrices generated by magnetic nulls. Here we briefly introduce/review the theories and some recent satellite observations of 3D magnetic reconnection. Topics to be further studied are also discussed.

关键词： magnetic reconnection null separatrix separator X-point X-line

Concept of the solar ring mission:An overview

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Science China(Technological Sciences) 2020年第9期63卷 1699-1713页

作者： wang YuMing JI HaiSheng wang YaMin XIA LiDong SHEN ChengLong GUO JingNan ZHANG QuanHao HUANG ZhengHua LIU Kai LI XiaoLei LIU Rui wang jingxiu wang Shui CAS Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of China(USTC)Hefei230026China CAS Center for Excellence in Comparative Planetology USTCHefei230026China Purple Mountain Observatory Chinese Academy of SciencesNanjing210034China CAS Key Lab of Microsatellite Innovation Academy for MicrosatellitesChinese Academy of SciencesShanghai201203China Shanghai Engineering Center for Microsatellites Shanghai201203China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai264209China Univeristy of Chinese Academy of Sciences Beijing100049China

The concept of the Solar Ring mission was gradually formed from L5/L4 mission concept, and the proposal of its pre-phase study was funded by the National Natural Science Foundation of China in November 2018 and then by the Strategic Priority Program of Chinese Academy of Sciences in space sciences in May 2019. Solar Ring mission will be the first attempt to routinely monitor and study the Sun and inner heliosphere from a full 360-degree perspective in the ecliptic plane. The current preliminary design of the Solar Ring mission is to deploy six spacecraft, grouped in three pairs, on a sub-AU orbit around the Sun. The two spacecraft in each group are separated by about 30?and every two groups by about 120?. This configuration with necessary science payloads will allow us to establish three unprecedented capabilities:(1) determine the photospheric vector magnetic field with unambiguity,(2) provide 360-degree maps of the Sun and the inner heliosphere routinely, and(3) resolve the solar wind structures at multiple scales and multiple longitudes. With these capabilities, the Solar Ring mission aims to address the origin of solar cycle, the origin of solar eruptions, the origin of solar wind structures and the origin of severe space weather events. The successful accomplishment of the mission will advance our understanding of the star and the space environment that hold our life and enhance our capability of expanding the next new territory of human.

关键词： space mission concept solar cycle solar eruptions solar wind space weather

Studies of Solar Vector Magnetic Field

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Bulletin of the Chinese Academy of Sciences 2011年第3期25卷 199-201页

作者： wang jingxiu Key Laboratory of Solar Activity National Astronomical Observatories CAS 100012

In this article,we report a few advances in the studies based on the solar vector magnetic field observations which were carried out mainly with the Solar Magnetic Field Telescope at the Huairou Solar Observing Station in the 1990s.(1) We developed necessary methodology and concepts in vector magnetogram analysis(wang et al.1996).For the first time,we proposed to use the photospheric free magnetic energy to quantify the major flare productivity of solar active regions(ARs),and it had been proved to be the best parameter in representing the major flare activity.(2) We revealed that there was always a dominant sense of magnetic shear in a given AR(wang 1994),which was taken as the premise of the helicity calculation in ARs;we made the first quantitative estimation of magnetic helicity evolution in ARs(wang 1996).(3) We identified the first group of evidence of magnetic reconnection in the lower solar atmosphere with vector magnetic field observations and proposed a two-step reconnection flare model to interpret the observed association of flux cancellation and flares(wang and Shi 1993).Efforts to quantify the major flare productivity of super active regions with vector magnetic field observations have been also taken.

关键词：太阳观测站矢量磁场耀斑活动磁场观测 ARS 太阳磁场最佳参数定量估计