Collaborative Research: Testing a New Concept for the Long-term Build-up to Coronal Mass Ejections

合作研究：测试日冕物质抛射长期积累的新概念

• 批准号: 0837910
• 负责人: Paul Bellan
• 金额: $ 12万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-12-01 至 2012-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0837910&HistoricalAwards=false
• 关键词: Collaborative; Research; Testing; New; Concept

The Principal Investigator (PI) has assembled an international collaboration to test whether coronal mass ejection (CME) build-up can be ascribed to a four-stage process of magnetic field evolution that ultimately leads to the triggering of a CME. This four stage process consists of (1) canceling of magnetic fields along a polarity reversal boundary; (2) formation of a filament channel concurrent with the ascent of horizontal magnetic field into the chromosphere from cancellation sites; (3) thread-by-thread formation of a filament magnetic field and visible filament when the filament channel attains maximum development; and finally, (4) thread-by-thread building of the filament cavity magnetic field as mass drains from the visible threads, thereby incrementally releasing filament magnetic field into the cavity magnetic field until one of many possible triggering mechanisms initiates the CME. The PI's team will examine these distinct stages and the mechanisms linking them, taking advantage of the synergy offered by new observations, data analysis, numerical modeling, analytic theory, and laboratory plasma experiments. The PI's team expects this project to provide a greatly improved understanding of how CMEs originate and evolve. This improved knowledge of the CME environment is needed to develop predictive tools so that critical space weather events can be accurately forecast.

首席研究员 (PI) 组建了一项国际合作，以测试日冕物质抛射 (CME) 的形成是否可以归因于最终导致触发 CME 的磁场演化的四阶段过程。这四个阶段的过程包括（1）沿极性反转边界消除磁场； (2) 与水平磁场从抵消位点上升到色球层同时形成细丝通道； (3)当细丝通道达到最大发展时，逐条形成细丝磁场和可见的细丝；最后，(4)随着质量从可见线中排出，逐条建立灯丝腔磁场，从而逐渐将灯丝磁场释放到腔磁场中，直到许多可能的触发机制之一启动CME。 PI 的团队将利用新观察、数据分析、数值建模、分析理论和实验室等离子体实验提供的协同作用，研究这些不同的阶段以及将它们联系起来的机制。 PI 团队期望该项目能够大大提高对 CME 如何起源和发展的理解。开发预测工具需要改进对日冕物质抛射环境的了解，以便准确预测关键的空间天气事件。