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

首席研究员（PI）已经组织了一个国际合作来测试日冕物质抛射（CME）的积累是否可以归因于磁场演化的四个阶段，最终导致日冕物质抛射的触发。这四个阶段的过程包括：(1)沿极性反转边界的磁场抵消；(2)随着水平磁场从抵消点上升到色球层，形成了一条细丝通道；(3)当灯丝通道达到最大发育时，逐线形成灯丝磁场和可见灯丝；最后，(4)随着质量从可见的线中流失，细丝腔磁场逐线建立，从而逐渐将细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的团队将研究这些不同的阶段和连接它们的机制，利用新的观察、数据分析、数值模拟、分析理论和实验室等离子体实验提供的协同作用。PI的团队希望这个项目能够大大提高对日冕物质抛射的起源和演变的理解。这种对日冕物质抛射环境的改进是开发预测工具所必需的，这样就可以准确地预测关键的空间天气事件。

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.