Solar active region energetics, magnetic polarity mixing and their relation to flares
太阳活动区能量学、磁极性混合及其与耀斑的关系
基本信息
- 批准号:2743123
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:英国
- 项目类别:Studentship
- 财政年份:2022
- 资助国家:英国
- 起止时间:2022 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Solar flares are among the most energetic events in the solar system, affecting physical systems from the solar surface to the heliosphere, geo-space and beyond. Flares, alongside coronal mass ejections (CMEs), are major contributors to space weather - changing conditions in the near-Earth space, magnetosphere and upper atmosphere. Flares mostly occur in active regions; parts of the solar atmosphere dominated by magnetic field. Flows move field around and, after enough energy accumulates and conditions are suitable, active regions can release free energy as flares/CMEs.Free energy stored by the magnetic field can be obtained from (computationally expensive) non-linear force-free field (NLFFF) extrapolations and is known to be sufficient to power flares/CMEs. However, the conditions required to initiate these events are unclear, limiting our ability to forecast them. The main forms of active region energy injection are known to be emergence of magnetic field through the solar surface and horizontal flows acting on previously emerged field, but we lack quantitative understanding of the contributions these injection processes provide to active region flaring/eruption energy budgets. Twisted magnetic field in active region atmospheres indicate that the field holds free energy, and directly relates to the complexity of magnetic-polarity spatial mixing on the surface. Quantifying the degree of polarity mixing and its relation to NLFFF-extrapolated energy budgets will provide a novel, computationally inexpensive free-energy proxy that has not previously been considered, while studying the motion/evolution of polarities in active regions will shed light on flare triggers. This project concerns the magnetic conditions that power and initiate flares, with the potential to impact on the quality/timeliness of adverse space weather forecasting and increasing the operational capacity of space-weather forecast centres (e.g., UK Met Office).This project aims to understand the roles that energy injection/storage and polarity mixing play in the production of flares in active regions, before utilizing this knowledge to develop new machine-learning flare forecasting schemes. The study of active region magnetic energy is dominated by case studies, but this work will provide a step change in understanding active region energetics by considering a large statistical sample. The aim will be achieved by:1) investigating the contributions of flux emergence and surface flows to magnetic energy evolution in flaring and non-flaring active regions;2) developing new measures to quantify the degree of magnetic-polarity mixing;3) examining the relation of flaring to energy injection/storage, polarity mixing, and motion/evolution of polarities within active regions;4) implementing machine-learning schemes to forecast flares using these measures/behaviours and quantifying their performance using verification metrics.
太阳耀斑是太阳系中能量最大的事件之一,影响从太阳表面到日光层、地理空间和更远的物理系统。耀斑与日冕物质抛射(日冕物质抛射)是造成近地空间、磁层和高层大气中空间气象条件变化的主要因素。耀斑大多发生在活动区;部分太阳大气受磁场支配。流动可以移动磁场,在足够的能量积累和条件合适的情况下,活动区可以释放自由能量作为耀斑/CME。由磁场存储的自由能可以从(计算代价高昂的)非线性无力场(NLFFF)外推获得,并且已知足以为耀斑/CME提供动力。然而,启动这些事件所需的条件尚不清楚,这限制了我们预测它们的能力。已知活动区能量注入的主要形式是通过太阳表面产生的磁场和作用于先前出现的场的水平流动,但我们缺乏对这些注入过程对活动区耀斑/喷发能量收支的贡献的定量了解。活动区大气中的扭曲磁场表明,该磁场具有自由能,并与表面磁极空间混合的复杂性直接相关。量化极性混合的程度及其与NLFFF外推能量收支的关系将提供一个计算上廉价的新的自由能指标,这是以前从未考虑过的,而研究活动区域中极性的运动/演化将有助于揭示耀斑触发因素。该项目涉及为耀斑提供动力和引发耀斑的磁场条件,有可能影响不利空间天气预报的质量/及时性,并提高空间气象预报中心(如英国气象局)的业务能力。该项目旨在了解能量注入/储存和极性混合在活动区域耀斑产生中的作用,然后利用这一知识制定新的机器学习耀斑预报方案。活动区磁能的研究以个案研究为主,但这项工作将通过考虑大的统计样本来改变对活动区能量学的理解。目标将通过以下方式实现:1)调查磁通量浮现和表面流动对耀斑和非耀斑活动区磁能演变的贡献;2)开发新的措施来量化磁极混合的程度;3)审查耀斑与能量注入/储存、极性混合以及活动区内极性运动/演变的关系;4)实施机器学习计划,利用这些措施/行为预报耀斑,并使用验证度量量化其表现。
项目成果
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其他文献
吉治仁志 他: "トランスジェニックマウスによるTIMP-1の線維化促進機序"最新医学. 55. 1781-1787 (2000)
Hitoshi Yoshiji 等:“转基因小鼠中 TIMP-1 的促纤维化机制”现代医学 55. 1781-1787 (2000)。
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LiDAR Implementations for Autonomous Vehicle Applications
- DOI:
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2021 - 期刊:
- 影响因子:0
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吉治仁志 他: "イラスト医学&サイエンスシリーズ血管の分子医学"羊土社(渋谷正史編). 125 (2000)
Hitoshi Yoshiji 等人:“血管医学与科学系列分子医学图解”Yodosha(涉谷正志编辑)125(2000)。
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Effect of manidipine hydrochloride,a calcium antagonist,on isoproterenol-induced left ventricular hypertrophy: "Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,K.,Teragaki,M.,Iwao,H.and Yoshikawa,J." Jpn Circ J. 62(1). 47-52 (1998)
钙拮抗剂盐酸马尼地平对异丙肾上腺素引起的左心室肥厚的影响:“Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,
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