Unified Relationship between Cold Plasma Ejections and Flare Energies Ranging from Solar Microflares to Giant Stellar Flares
Unified Relationship between Cold Plasma Ejections and Flare Energies Ranging from Solar Microflares to Giant Stellar Flares
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DOI：
10.3847/1538-4357/acac76
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Yuji Kotani;Kazunari Shibata;T. Ishii;D. Yamasaki;Ken Otsuji;K. Ichimoto;A. Asai
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文献类型：
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作者：
Yuji Kotani;Kazunari Shibata;T. Ishii;D. Yamasaki;Ken Otsuji;K. Ichimoto;A. Asai
在太阳和恒星大气中，我们经常发现色球冷等离子体喷射伴随耀斑的光谱特征。然而，物理量（如质量，动能和速度）的冷喷出物和耀斑能量之间的关系还没有被调查在一个统一的方式为整个范围的耀斑能量的日期。这项研究分析了与小尺度耀斑和太阳耀斑（能量1025-1029 erg）相关的冷等离子体喷射光谱，以提供更小的能量样本。利用太阳磁活动研究望远镜上的太阳动力学多普勒成像仪进行了Hα成像光谱观测。用云模型拟合Hα谱确定了喷出物的物理量。我们确定的耀斑能量的差分发射测量分析使用的大气成像组件上的太阳动力学观测小规模的耀斑和估计的热能量为大规模的耀斑。结果发现，耀斑的抛射质量M与耀斑总能量E tot之间存在M <$E tot ~（2/3）的关系。我们表明，从一个简单的物理模型导出的标度律解释了太阳和恒星的观测与日冕磁场强度作为一个自由参数。我们还发现，喷出物的动能和速度与耀斑能量相关。这些结果表明，由磁场驱动的共同机制导致太阳和恒星上的冷等离子体喷射和耀斑。
We often find spectral signatures of chromospheric cold plasma ejections accompanied by flares in a wide range of spatial scales in the solar and stellar atmospheres. However, the relationship between physical quantities (such as mass, kinetic energy, and velocity) of cold ejecta and flare energy has not been investigated in a unified manner for the entire range of flare energies to date. This study analyzed the spectra of cold plasma ejections associated with small-scale flares and solar flares (energy 1025–1029 erg) to supply smaller energy samples. We performed Hα imaging spectroscopy observation by the Solar Dynamics Doppler Imager on the Solar Magnetic Activity Research Telescope. We determined the physical quantities of the ejecta by cloud model fitting to the Hα spectrum. We determined the flare energy by differential emission measure analysis using the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory for small-scale flares and by estimating the bolometric energy for large-scale flares. As a result, we found that the ejection mass M and the total flare energy E tot follow a relation of M∝Etot2/3 . We show that the scaling law derived from a simple physical model explains the solar and stellar observations with a coronal magnetic field strength as a free parameter. We also found that the kinetic energy and velocity of the ejecta correlate with the flare energy. These results suggest a common mechanism driven by magnetic fields to cause cold plasma ejections with flares on the Sun and stars.