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arXiv 2108.01299astro-ph.SR
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爆发型和封闭型太阳耀斑活动区的磁通量和磁无势

Magnetic Flux and Magnetic Non-potentiality of Active Regions in Eruptive and Confined Solar Flares

Ting Li, Anqin Chen, Yijun Hou, Astrid M. Veronig, Shuhong Yang, Jun Zhang

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Accepted for publication in ApJ Letters; 16 pages, 4 figures
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摘要：

为了了解活动区（AR）的磁特性如何控制太阳耀斑的爆发特征，我们分析了2010年$-$ 2019年期间地球同步业务环境卫星（GOES）$\geq$ C5.0级的719个耀斑。我们进行了第一次统计研究，调查耀斑-日冕物质抛射（CME）的关联率作为耀斑强度和AR特性的函数，产生耀斑，在其总的无符号磁通量（$Φ$ $_{AR}$）。我们的结果表明，耀斑-CME的关联率与耀斑强度的斜率揭示了一个陡峭的单调减少与$Φ$ $_{AR}$。这意味着，同样的GOES类耀斑，但起源于更大的$Φ$ $_{AR}$的AR，更有可能被限制。基于太阳型恒星的AR通量高达1.0 $\times$ $10^{24}$ Mx，我们估计X 100类"超耀斑”的CME缔合率不超过50%.对132个$\geq$ M2.0级耀斑样本，测量了陡梯度极性反转线长度（L $_{SGPIL}$）、光球总自由磁能（E $_{free}$）和大剪切角面积（A $_Ψ$）3个非位参数。我们发现，局限耀斑往往有较大的值的L $_{SGPIL}$，E $_{free}$和A $_Ψ$喷发耀斑相比。每个非潜在参数均显示与$Φ$ $_{AR}$中度正相关。我们的研究结果意味着$Φ$ $_{AR}$是一个决定性的量描述的爆发性质的耀斑，因为它提供了一个全球性的参数有关的背景场约束的强度。

英文摘要：

With the aim of understanding how the magnetic properties of active regions (ARs) control the eruptive character of solar flares, we analyze 719 flares of Geostationary Operational Environmental Satellite (GOES) class $\geq$C5.0 during 2010$-$2019. We carry out the first statistical study that investigates the flare-coronal mass ejections (CMEs) association rate as function of the flare intensity and the AR characteristics that produces the flare, in terms of its total unsigned magnetic flux ($Φ$$_{AR}$). Our results show that the slope of the flare-CME association rate with flare intensity reveals a steep monotonic decrease with $Φ$$_{AR}$. This means that flares of the same GOES class but originating from an AR of larger $Φ$$_{AR}$, are much more likely confined. Based on an AR flux as high as 1.0$\times$$10^{24}$ Mx for solar-type stars, we estimate that the CME association rate in X100-class ``superflares" is no more than 50\%. For a sample of 132 flares $\geq$M2.0 class, we measure three non-potential parameters including the length of steep gradient polarity inversion line (L$_{SGPIL}$), the total photospheric free magnetic energy (E$_{free}$) and the area with large shear angle (A$_Ψ$). We find that confined flares tend to have larger values of L$_{SGPIL}$, E$_{free}$ and A$_Ψ$ compared to eruptive flares. Each non-potential parameter shows a moderate positive correlation with $Φ$$_{AR}$. Our results imply that $Φ$$_{AR}$ is a decisive quantity describing the eruptive character of a flare, as it provides a global parameter relating to the strength of the background field confinement.

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