NSWP: Magnetic Reconnection and Distribution of Accelerated Electrons in Solar Flares

NSWP：太阳耀斑中加速电子的磁重联和分布

• 批准号: 0819662
• 负责人: Chang Liu
• 金额: $ 14.22万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0819662&HistoricalAwards=false
• 关键词: NSWP; Magnetic; Reconnection; Distribution; Accelerated

The Principal Investigator will study magnetic reconnection and the associated flare energy release in the form of accelerated electrons, particularly in sigmoidal solar active regions. The proposing team will carry out a comprehensive investigation of solar flare and CME events using newly improved hard X-ray (HXR) imaging and spectroscopy techniques. They will further examine the association of ribbon-like HXR sources with sigmoid eruptions, while quantitatively analyzing the spatial distribution of accelerated electrons and its evolution in the flaring process, in order to establish the most realistic 3D magnetic reconnection scenario.The PI plans to investigate flare ribbon dynamics, paying special attention to the early phase of solar flare and CME eruptions. Using multi-wavelength data, the proposers will examine the physics of interrelated flaring phenomena, such as contracting-to-separation development and strong-to-weak shear change in H-alpha and EUV/UV, footpoint-to-ribbon evolution in HXR, and sigmoid-to-arcade transformation in EUV and soft X-ray (SXR). The PI will also use the HXR spectral index as a probe to diagnose electron acceleration during flares. The team will study the temporal and spatial relationship between the electric field in reconnecting current sheets and the spectral index of detected HXRs, in order to better understand the electron acceleration mechanism.Given that sigmoidal structures are among the most important signatures for impending space weather events, this study will contribute significantly to the National Space Weather Program (NSWP) goal of mitigating the adverse effects of space weather on society's technological infrastructure. The PI's status as a beginning postdoctoral researcher constitutes this project's education and training component.

首席研究者将以加速电子的形式研究磁重新连接和相关的耀斑释放，特别是在Sigmoidal太阳活性区域。提议的团队将使用新的改进的硬X射线（HXR）成像和光谱技术进行全面研究太阳耀斑和CME事件。他们将进一步研究带有色带的HXR源与乙状结肠喷发的关联，同时定量分析加速电子的空间分布及其在耀斑过程中的演变，以建立最现实的3D磁性重新连接方案。使用多波长数据，提议者将检查相互关联的耀斑现象的物理学，例如H-Alpha和EUV/UV中的合同到分离发展以及HXR中的脚关 - 毫无疑问，HXR中的脚关 - 丝带进化，以及EUV和Soft X-Ray中的Sigmoid-to-Aracoid-to-Aracoid to-Aracoid-to-Aracoid-to-to-raccade Transformation（SXR）。 PI还将使用HXR光谱指数作为探针来诊断耀斑期间电子加速度。 The team will study the temporal and spatial relationship between the electric field in reconnecting current sheets and the spectral index of detected HXRs, in order to better understand the electron acceleration mechanism.Given that sigmoidal structures are among the most important signatures for impending space weather events, this study will contribute significantly to the National Space Weather Program (NSWP) goal of mitigating the adverse effects of space weather on society's technological 基础设施。 PI作为开始的博士后研究人员的地位构成了该项目的教育和培训部分。