The Role of Magnetic Helicity in Coronal Mass Ejections
The Role of Magnetic Helicity in Coronal Mass Ejections
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DOI：
10.1086/430516
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发表时间：
2005-04
期刊：
影响因子：
--
通讯作者：
A. D. Phillips;P. MacNeice;S. Antiochos
中科院分区：
文献类型：
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作者：
A. D. Phillips;P. MacNeice;S. Antiochos
我们调查的因素负责启动日冕物质抛射（CME），特别是磁螺旋度的作用。利用CME爆发模型的数值模拟，我们表明，爆发发生在一个固定的幅度的自由能在日冕中，独立的螺旋度值。几乎相同的爆发都得到了大的和零螺旋度的情况下。此外，喷发实际上会导致日冕中剩余螺旋度的增加。这些结果强烈反对最近的模型，假设一个关键的螺旋度建设和脱落的决定因素CME启动。
We investigate the factors responsible for initiating coronal mass ejections (CMEs), specifically, the role of magnetic helicity. Using numerical simulations of the breakout model for CMEs, we show that eruption occurs at a fixed magnitude of free energy in the corona, independent of the value of helicity. Almost identical eruptions are obtained for both large and zero-helicity cases. Furthermore, the eruption can actually lead to an increase in the helicity remaining in the corona. These results argue strongly against recent models that postulate a critical helicity buildup and shedding as the determining factors for CME initiation.