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arXiv 1708.04055astro-ph.SR
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太阳爆发与局部磁参数

Solar Eruption and Local Magnetic Parameters

Jeongwoo Lee, Chang Liu, Ju Jing, Jongchul Chae

摘要:

现在,通常的做法是使用局部磁参数,如磁衰减指数来解释活跃区的太阳爆发,但也有另一种观点,即源区的全球性质应被视为一个更重要的因素。利用\it Solar Dynamics Observatory(SDO)对NOAA活动区11444在1.5小时内连续三次喷发的观测资料和非线性无力场(NLFFF)模型计算的磁场参数,讨论了这一问题。在暗条的名义高度(12 $''$)处,磁扭曲数(0.5- 1.5)和衰变指数(0.9- 1.1)相对较高的区域发生了两次剧烈的喷发,而在其他区域发生了一次温和的喷发,这支持了局部参数范式。我们的主要观点是,火山爆发的时间顺序与这些参数不符。有人认为,一个额外的因素,在稳定的力量的形式,应操作,以确定第一次喷发和随后的喷发的时间行为的发作。作为支持的证据,我们报告说,加热和快速等离子体流持续一个小时的时间尺度是第一次喷发的直接原因,而干扰的单向传播决定了随后喷发的时间。这两个因素都与整体磁结构有关,而不是与有源区的局部磁特性有关。

英文摘要:

It is now a common practice to use local magnetic parameters such as magnetic decay index for explaining solar eruptions from active regions, but there can be an alternative view that the global properties of the source region should be counted as a more important factor. We discuss this issue based on {\it Solar Dynamics Observatory} (SDO) observations of the three successive eruptions within 1.5 hours from the NOAA active region 11444 and the magnetic parameters calculated using the nonlinear force-free field (NLFFF) model. Two violent eruptions occurred in the regions with relatively high magnetic twist number (0.5--1.5) and high decay index (0.9--1.1) at the nominal height of the filament (12$''$) and otherwise a mild eruption occurred, which supports the local parameter paradigm. Our main point is that the time sequence of the eruptions did not go with these parameters. It is argued that an additional factor, in the form of stabilizing force, should operate to determine the onset of the first eruption and temporal behaviors of subsequent eruptions. As supporting evidence, we report that the heating and fast plasma flow continuing for a timescale of an hour was the direct cause for the first eruption, and that the unidirectional propagation of the disturbance determined the timing of subsequent eruptions. Both of these factors are associated with the overall magnetic structure rather than local magnetic properties of the active region.

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