Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption
Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption
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DOI：
10.3847/1538-4357/ab5d39
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
L. Doyle;P. Wyper;E. Scullion;J. McLaughlin;G. Ramsay;J. Doyle
中科院分区：
文献类型：
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作者：
L. Doyle;P. Wyper;E. Scullion;J. McLaughlin;G. Ramsay;J. Doyle
我们提出了一个详细的分析与C1.5级太阳耀斑的局限的暗条喷发和喷流。全球振荡网络小组和太阳动力学观测台的多波长观测显示，在一个衰减的双极活动区域内，少数极性斑点出现后，在几天内形成了暗条，然后部分取消。这一现象的出现也与围绕少数极性的3D零点分界线的形成有关。暗条喷发与暗条附近和下方的增亮同时发生，分别暗示着爆发和耀斑重连。喷发的暗条物质部分转移到沿着冕环的强喷流（每秒约60公里）中，并被引导回地表。利用瑞典太阳望远镜/CRisp成像光谱偏振仪的高分辨率Hα观测，我们构建了外流的速度图，展示了它们的高度结构化但广泛的螺旋性质。我们对比的意见与3D磁流体动力学模拟的爆发射流在一个封闭的磁场背景，并找到密切的定性协议。我们的结论是，建议的模型提供了一个直观的机制，转移扭曲/螺旋度在受限的灯丝爆发，从而验证了突破模型的适用性，不仅射流和日冕物质抛射，但也局限爆发和耀斑。
We present a detailed analysis of a confined filament eruption and jet associated with a C1.5 class solar flare. Multi-wavelength observations from the Global Oscillations Network Group and Solar Dynamics Observatory reveal the filament forming over several days following the emergence and then partial cancellation of a minority polarity spot within a decaying bipolar active region. The emergence is also associated with the formation of a 3D null point separatrix that surrounds the minority polarity. The filament eruption occurs concurrently with brightenings adjacent to and below the filament, suggestive of breakout and flare reconnection, respectively. The erupting filament material becomes partially transferred into a strong outflow jet (∼60 km s−1) along coronal loops, becoming guided back toward the surface. Utilizing high-resolution Hα observations from the Swedish Solar Telescope/CRisp Imaging SpectroPolarimeter, we construct velocity maps of the outflows, demonstrating their highly structured but broadly helical nature. We contrast the observations with a 3D magnetohydrodynamic simulation of a breakout jet in a closed-field background and find close qualitative agreement. We conclude that the suggested model provides an intuitive mechanism for transferring twist/helicity in confined filament eruptions, thus validating the applicability of the breakout model not only to jets and coronal mass ejections but also to confined eruptions and flares.