本文主要研究内容
作者王雯思（2019）在《太阳磁通量绳形成与演化过程的研究》一文中研究指出：磁通量绳是一种基本磁化等离子体结构,表现为一组磁力线绕其中心轴扭缠。它的尺度横跨十几个数量级,在实验室等离子体装置、地球磁层、太阳大气、行星际空间、甚至星系宇宙均有相关研究。在太阳大气中,磁通量绳通常被认为与大尺度爆发活动有关。太阳大尺度爆发活动包括暗条爆发、耀斑、日冕物质抛射等等。这些爆发活动对地球空间环境有重要影响,是灾害性空间天气的驱动源。研究太阳磁通量绳的形成与演化过程,对深入理解太阳大尺度爆发活动的产生机制,提高灾害性空间预报有重要意义。同时太阳磁通量绳形成与演化过程的研究结果可为太阳系外天体的相关研究提供参考。目前的研究已经证实爆发后确实存在一个磁通量绳,且起源于太阳。但是磁通量绳是怎么形成的,形成之后会如何演化,在爆发前是否存在磁通量绳等问题到现在还没有完全解决。通过分析目前高分辨率太阳成像望远镜和行星际局地探测卫星的数据,运用与发展最新的图像识别技术,并借助国际上先进的重构方法、磁场外推方法与数据驱动模拟方法,我们可以对太阳磁通量绳形成与演化过程进行深入的研究。在本文中,我们首先分析了三个代表性的磁通量绳形成与演化事件,揭露了磁通量绳的内部结构,讨论了磁重联对磁通量绳形成与演化的作用与影响,给出了磁通量绳爆发的条件。之后,我们从磁通量绳的足点出发,统计研究了光球层演化与磁通量绳形成的关系。文章的具体内容如下:爆发前磁通量绳如何演化到临界爆发条件是研究爆发机制的一个关键问题。结合SDO与STEREO多角度观测,我们发现一个磁通量绳在经历了长达5个小时的缓慢膨胀后突然爆发。这种长时间多角度的观测数据,使得我们可以详细地分析磁通量绳爆发前的演化过程。进一步的分析发现磁通量绳的足点位于光球层强电流区域。因此我们可以利用光球层磁场数据直接估算出爆发之前磁通量绳的扭缠圈数T。研究结果表明,在这5个小时的准静态演化过程中,磁通量绳的平均扭缠增长了1圈左右。之后,我们详细地探讨了磁重联和光球层演化对这种增长过程的作用。我们发现爆发前这5个小时的准静态演化很可能与磁重联相关,而之后的爆发过程更可能是由torus不稳定性触发。磁通量绳的非爆发性演化过程也同样值得关注。最近的研究工作发现日珥暗腔系统会出现类龙卷风运动,而这种运动引起了广泛的关注。一般的解释是,当日珥物质沿着暗腔的螺旋磁场运动时,会表现为这样的旋转运动。而我们观测到与以往不同的大尺度龙卷风演化,即大尺度日珥的整体旋转运动。我们的分析发现这种现象可能对应磁通量绳的一种非爆发性演化过程。通过对SDO多个波段观测数据的分析与光球层磁场外推分析,我们发现这种类似龙卷风的整体旋转运动很有可能是由kink不稳定性驱动的。这个过程与之前暗条失败的爆发事件类似。日珥首先扭曲上升,之后与周围磁场重联,出现亮的垂直纤维结构,而后这些纤维结构快速旋转,大部分日珥物质随着这些亮纤维结构回落到日珥通道之外的区域。随后日珥结构整体瓦解,剩余的物质会沿螺旋形磁力线回到原有的通道中。尽管在地球附近的局地测量结果证实爆发之后存在磁通量绳结构,但是爆发之前是否存在磁通量绳仍旧存在争议。我们观测到一种新型的双带耀斑演化过程:在耀斑双带的最远端,出现由亮点扩散为不规则亮环的过程。而亮环包围了一对共轭暗化区域,被认证为磁通量绳的足点。这一演化过程表明,磁通量绳主体是在爆发过程中通过磁重联形成的,亮环为磁通量绳边界准分界层的’足迹’。根据理论模型,磁通量绳的环向磁通Φp可以通过双带耀斑扫过面积来估算;而轴向磁通Φt则由其足点区域计算。这两个量的比值可以用来估算磁通量绳平均扭缠圈数,同时△Φp/△Φt的时间变化表征了扭缠空间分布情况。我们发现磁通量绳核心高度扭缠,由内向外扭缠度下降,这种非均匀扭缠分布与近地卫星的局地观测重构结果一致。而我们观测进一步给出这种非均匀扭缠分布与磁重联率相关。现有的模型无法解释这种由磁重联导致的非均匀扭缠分布。我们通过详细分析磁通量绳足点的演化过程,发现磁通量绳与周围磁场的重联对光球层磁场也有显著影响。在爆发过程中,足点边界的亮带分别先后两次扫过足点与黑子半影重合的区域,表明有两种不同的重联过程发生在该区域。在第一阶段的重联过程中,原本沿黑子磁力线向上传播的本影波在重合区域消失,同时该区域的光球层纵场和横场突然同步减小,表明剪切磁场转换成扭缠磁场。而在第二阶段的重联过程中,本影波恢复在重合区域的传播,同时该区域的光球层纵场和横场快速增加,表明扭缠磁场消失,磁通量绳在上升过程中与外部磁场重联,导致重合区域的扭缠磁场逐步转换成其他磁场结构。光球层演化是否与磁通量绳形成有直接关系?而光球层强电流区域通常表征光球层各类演化过程。为了研究这个问题,我们从磁通量绳足点出发,统计研究了足点与光球层强电流的关系。我们选取了 10个与强电流相关的活动区,并分为三类,一类只有黑子旋转运动,一类只有中性线附近的强剪切运动,最后一类是两者均有。我们分析了这些活动区产生的12个爆发事件,每个事件都有对应的CME,也观测到了与磁通量绳相关的结构。所有的事件都观测到明显的共轭暗化现象,我们以此确定了所有事件的磁通量绳足点。统计结果表明,大部分事件中磁通量绳的足点都在强电流区域。此外,我们发现有一半的事件,其足点的暗化现象出现在爆发之前。而这些事件的一个足点都与旋转的黑子相关。
Abstract
ci tong liang sheng shi yi chong ji ben ci hua deng li zi ti jie gou ,biao xian wei yi zu ci li xian rao ji zhong xin zhou niu chan 。ta de che du heng kua shi ji ge shu liang ji ,zai shi yan shi deng li zi ti zhuang zhi 、de qiu ci ceng 、tai yang da qi 、hang xing ji kong jian 、shen zhi xing ji yu zhou jun you xiang guan yan jiu 。zai tai yang da qi zhong ,ci tong liang sheng tong chang bei ren wei yu da che du bao fa huo dong you guan 。tai yang da che du bao fa huo dong bao gua an tiao bao fa 、yao ban 、ri mian wu zhi pao she deng deng 。zhe xie bao fa huo dong dui de qiu kong jian huan jing you chong yao ying xiang ,shi zai hai xing kong jian tian qi de qu dong yuan 。yan jiu tai yang ci tong liang sheng de xing cheng yu yan hua guo cheng ,dui shen ru li jie tai yang da che du bao fa huo dong de chan sheng ji zhi ,di gao zai hai xing kong jian yu bao you chong yao yi yi 。tong shi tai yang ci tong liang sheng xing cheng yu yan hua guo cheng de yan jiu jie guo ke wei tai yang ji wai tian ti de xiang guan yan jiu di gong can kao 。mu qian de yan jiu yi jing zheng shi bao fa hou que shi cun zai yi ge ci tong liang sheng ,ju qi yuan yu tai yang 。dan shi ci tong liang sheng shi zen me xing cheng de ,xing cheng zhi hou hui ru he yan hua ,zai bao fa qian shi fou cun zai ci tong liang sheng deng wen ti dao xian zai hai mei you wan quan jie jue 。tong guo fen xi mu qian gao fen bian lv tai yang cheng xiang wang yuan jing he hang xing ji ju de tan ce wei xing de shu ju ,yun yong yu fa zhan zui xin de tu xiang shi bie ji shu ,bing jie zhu guo ji shang xian jin de chong gou fang fa 、ci chang wai tui fang fa yu shu ju qu dong mo ni fang fa ,wo men ke yi dui tai yang ci tong liang sheng xing cheng yu yan hua guo cheng jin hang shen ru de yan jiu 。zai ben wen zhong ,wo men shou xian fen xi le san ge dai biao xing de ci tong liang sheng xing cheng yu yan hua shi jian ,jie lou le ci tong liang sheng de nei bu jie gou ,tao lun le ci chong lian dui ci tong liang sheng xing cheng yu yan hua de zuo yong yu ying xiang ,gei chu le ci tong liang sheng bao fa de tiao jian 。zhi hou ,wo men cong ci tong liang sheng de zu dian chu fa ,tong ji yan jiu le guang qiu ceng yan hua yu ci tong liang sheng xing cheng de guan ji 。wen zhang de ju ti nei rong ru xia :bao fa qian ci tong liang sheng ru he yan hua dao lin jie bao fa tiao jian shi yan jiu bao fa ji zhi de yi ge guan jian wen ti 。jie ge SDOyu STEREOduo jiao du guan ce ,wo men fa xian yi ge ci tong liang sheng zai jing li le chang da 5ge xiao shi de huan man peng zhang hou tu ran bao fa 。zhe chong chang shi jian duo jiao du de guan ce shu ju ,shi de wo men ke yi xiang xi de fen xi ci tong liang sheng bao fa qian de yan hua guo cheng 。jin yi bu de fen xi fa xian ci tong liang sheng de zu dian wei yu guang qiu ceng jiang dian liu ou yu 。yin ci wo men ke yi li yong guang qiu ceng ci chang shu ju zhi jie gu suan chu bao fa zhi qian ci tong liang sheng de niu chan juan shu T。yan jiu jie guo biao ming ,zai zhe 5ge xiao shi de zhun jing tai yan hua guo cheng zhong ,ci tong liang sheng de ping jun niu chan zeng chang le 1juan zuo you 。zhi hou ,wo men xiang xi de tan tao le ci chong lian he guang qiu ceng yan hua dui zhe chong zeng chang guo cheng de zuo yong 。wo men fa xian bao fa qian zhe 5ge xiao shi de zhun jing tai yan hua hen ke neng yu ci chong lian xiang guan ,er zhi hou de bao fa guo cheng geng ke neng shi you torusbu wen ding xing chu fa 。ci tong liang sheng de fei bao fa xing yan hua guo cheng ye tong yang zhi de guan zhu 。zui jin de yan jiu gong zuo fa xian ri er an qiang ji tong hui chu xian lei long juan feng yun dong ,er zhe chong yun dong yin qi le an fan de guan zhu 。yi ban de jie shi shi ,dang ri er wu zhi yan zhao an qiang de luo xuan ci chang yun dong shi ,hui biao xian wei zhe yang de xuan zhuai yun dong 。er wo men guan ce dao yu yi wang bu tong de da che du long juan feng yan hua ,ji da che du ri er de zheng ti xuan zhuai yun dong 。wo men de fen xi fa xian zhe chong xian xiang ke neng dui ying ci tong liang sheng de yi chong fei bao fa xing yan hua guo cheng 。tong guo dui SDOduo ge bo duan guan ce shu ju de fen xi yu guang qiu ceng ci chang wai tui fen xi ,wo men fa xian zhe chong lei shi long juan feng de zheng ti xuan zhuai yun dong hen you ke neng shi you kinkbu wen ding xing qu dong de 。zhe ge guo cheng yu zhi qian an tiao shi bai de bao fa shi jian lei shi 。ri er shou xian niu qu shang sheng ,zhi hou yu zhou wei ci chang chong lian ,chu xian liang de chui zhi qian wei jie gou ,er hou zhe xie qian wei jie gou kuai su xuan zhuai ,da bu fen ri er wu zhi sui zhao zhe xie liang qian wei jie gou hui la dao ri er tong dao zhi wai de ou yu 。sui hou ri er jie gou zheng ti wa jie ,sheng yu de wu zhi hui yan luo xuan xing ci li xian hui dao yuan you de tong dao zhong 。jin guan zai de qiu fu jin de ju de ce liang jie guo zheng shi bao fa zhi hou cun zai ci tong liang sheng jie gou ,dan shi bao fa zhi qian shi fou cun zai ci tong liang sheng reng jiu cun zai zheng yi 。wo men guan ce dao yi chong xin xing de shuang dai yao ban yan hua guo cheng :zai yao ban shuang dai de zui yuan duan ,chu xian you liang dian kuo san wei bu gui ze liang huan de guo cheng 。er liang huan bao wei le yi dui gong e an hua ou yu ,bei ren zheng wei ci tong liang sheng de zu dian 。zhe yi yan hua guo cheng biao ming ,ci tong liang sheng zhu ti shi zai bao fa guo cheng zhong tong guo ci chong lian xing cheng de ,liang huan wei ci tong liang sheng bian jie zhun fen jie ceng de ’zu ji ’。gen ju li lun mo xing ,ci tong liang sheng de huan xiang ci tong Φpke yi tong guo shuang dai yao ban sao guo mian ji lai gu suan ;er zhou xiang ci tong Φtze you ji zu dian ou yu ji suan 。zhe liang ge liang de bi zhi ke yi yong lai gu suan ci tong liang sheng ping jun niu chan juan shu ,tong shi △Φp/△Φtde shi jian bian hua biao zheng le niu chan kong jian fen bu qing kuang 。wo men fa xian ci tong liang sheng he xin gao du niu chan ,you nei xiang wai niu chan du xia jiang ,zhe chong fei jun yun niu chan fen bu yu jin de wei xing de ju de guan ce chong gou jie guo yi zhi 。er wo men guan ce jin yi bu gei chu zhe chong fei jun yun niu chan fen bu yu ci chong lian lv xiang guan 。xian you de mo xing mo fa jie shi zhe chong you ci chong lian dao zhi de fei jun yun niu chan fen bu 。wo men tong guo xiang xi fen xi ci tong liang sheng zu dian de yan hua guo cheng ,fa xian ci tong liang sheng yu zhou wei ci chang de chong lian dui guang qiu ceng ci chang ye you xian zhe ying xiang 。zai bao fa guo cheng zhong ,zu dian bian jie de liang dai fen bie xian hou liang ci sao guo zu dian yu hei zi ban ying chong ge de ou yu ,biao ming you liang chong bu tong de chong lian guo cheng fa sheng zai gai ou yu 。zai di yi jie duan de chong lian guo cheng zhong ,yuan ben yan hei zi ci li xian xiang shang chuan bo de ben ying bo zai chong ge ou yu xiao shi ,tong shi gai ou yu de guang qiu ceng zong chang he heng chang tu ran tong bu jian xiao ,biao ming jian qie ci chang zhuai huan cheng niu chan ci chang 。er zai di er jie duan de chong lian guo cheng zhong ,ben ying bo hui fu zai chong ge ou yu de chuan bo ,tong shi gai ou yu de guang qiu ceng zong chang he heng chang kuai su zeng jia ,biao ming niu chan ci chang xiao shi ,ci tong liang sheng zai shang sheng guo cheng zhong yu wai bu ci chang chong lian ,dao zhi chong ge ou yu de niu chan ci chang zhu bu zhuai huan cheng ji ta ci chang jie gou 。guang qiu ceng yan hua shi fou yu ci tong liang sheng xing cheng you zhi jie guan ji ?er guang qiu ceng jiang dian liu ou yu tong chang biao zheng guang qiu ceng ge lei yan hua guo cheng 。wei le yan jiu zhe ge wen ti ,wo men cong ci tong liang sheng zu dian chu fa ,tong ji yan jiu le zu dian yu guang qiu ceng jiang dian liu de guan ji 。wo men shua qu le 10ge yu jiang dian liu xiang guan de huo dong ou ,bing fen wei san lei ,yi lei zhi you hei zi xuan zhuai yun dong ,yi lei zhi you zhong xing xian fu jin de jiang jian qie yun dong ,zui hou yi lei shi liang zhe jun you 。wo men fen xi le zhe xie huo dong ou chan sheng de 12ge bao fa shi jian ,mei ge shi jian dou you dui ying de CME,ye guan ce dao le yu ci tong liang sheng xiang guan de jie gou 。suo you de shi jian dou guan ce dao ming xian de gong e an hua xian xiang ,wo men yi ci que ding le suo you shi jian de ci tong liang sheng zu dian 。tong ji jie guo biao ming ,da bu fen shi jian zhong ci tong liang sheng de zu dian dou zai jiang dian liu ou yu 。ci wai ,wo men fa xian you yi ban de shi jian ,ji zu dian de an hua xian xiang chu xian zai bao fa zhi qian 。er zhe xie shi jian de yi ge zu dian dou yu xuan zhuai de hei zi xiang guan 。
论文参考文献
论文详细介绍
论文作者分别是来自中国科学技术大学的王雯思，发表于刊物中国科学技术大学2019-07-12论文，是一篇关于磁通量绳论文,磁重联论文,耀斑论文,日冕物质抛射论文,光球层演化论文,中国科学技术大学2019-07-12论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自中国科学技术大学2019-07-12论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：磁通量绳论文; 磁重联论文; 耀斑论文; 日冕物质抛射论文; 光球层演化论文; 中国科学技术大学2019-07-12论文;