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arXiv 1712.09045astro-ph.SR
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与磁通量绳喷发有关的准周期快速传播磁声波

A quasi-periodic fast-propagating magnetosonic wave associated with the eruption of a magnetic flux rope

Yuandeng Shen, Yu Liu, Tengfei Song, Zhanjun Tian

摘要:

利用太阳动力学天文台大气成像组件的高时空分辨率观测资料,对与磁通量绳和GOES C5.0耀斑爆发有关的高质量准周期快传磁声波进行了详细的观测分析。我们第一次发现QFP波在整个耀斑寿命期间持续,而不是像以前的研究报告那样只在伴随耀斑的上升阶段持续。此外,波列的不同部分的传播表现出不同的运动学和形态。南(北)部的速度、持续时间和强度变化分别约为875 +/- 29(1485 +/- 233)km/s、45(60)分钟和4%(2%),显著周期分别为106 +/- 12和160 +/- 18(75 +/- 10和120 +/- 16)秒。有趣的是,波列的北部在通过强磁场区时表现出明显的折射效应。周期性分析结果表明,QFP波的所有周期都可以在伴随耀斑的周期谱中找到,表明它们有共同的物理起源。我们认为,产生伴随耀斑的磁重联中的准周期非线性磁流体动力学过程对QFP波的激发起着重要的作用,不同路径上的磁场分布可以解释波前的不同速度和形态演化。

英文摘要:

Using high temporal and high spatial resolution observations taken by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory, we present the detailed observational analysis of a high quality quasi-periodic fast- propagating (QFP) magnetosonic wave that was associated with the eruption of a magnetic flux rope and a GOES C5.0 flare. For the first time, we find that the QFP wave lasted during the entire flare lifetime rather than only the rising phase of the accompanying flare as reported in previous studies. In addition, the propagation of the different parts of the wave train showed different kinematics and morphologies. For the southern (northern) part, the speed, duration, intensity variation are about 875 +/- 29 (1485 +/- 233) km/s, 45 (60) minutes, and 4% (2%), and the pronounced periods of them are 106 +/- 12 and 160 +/- 18 (75 +/- 10 and 120 +/- 16) seconds, respectively. It is interesting that the northern part of the wave train showed obvious refraction effect when they pass through a region of strong magnetic field. Periodicity analysis result indicates that all the periods of the QFP wave can be found in the period spectrum of the accompanying flare, suggesting their common physical origin. We propose that the quasi-periodic nonlinear magnetohydrodynamics process in the magnetic reconnection that produces the accompanying flare should be important for exciting of QFP wave, and the different magnetic distribution along different paths can account for the different speeds and morphology evolution of the wave fronts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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