A Statistical Comparison of EUV Brightenings Observed by SO/EUI with Simulated Brightenings in Nonpotential Simulations.
A Statistical Comparison of EUV Brightenings Observed by SO/EUI with Simulated Brightenings in Nonpotential Simulations.
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DOI：
10.1007/s11207-022-02074-6
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发表时间：
2022
期刊：
影响因子：
2.8
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中科院分区：
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太阳轨道器上的极紫外成像仪（EUI）仪器的高分辨率成像仪（HRIEUV）望远镜观察到极紫外增亮，即所谓的篝火，作为日冕温度下的精细结构。本文的目标是比较的基本几何（大小，方向）和物理（强度，寿命）的EUV增亮与区域的能量耗散在一个非潜在的日冕磁场模拟的属性。在模拟中，HMI视线磁图被用作输入，以驱动太阳日冕磁场和能量耗散的演变。我们对HRIEUV望远镜于2020年5月30日获得的EUV图像应用了自动EUV增亮检测方法。我们应用相同的检测方法，从非势模拟模拟的能量耗散图检测模拟增亮。我们在EUI观测中检测到具有亮度/Mm 2密度的EUV亮度，并且在模拟中检测到-亮度/Mm 2之间的模拟亮度，对于相同的时间范围。虽然在模拟中产生了明显更多的增亮，但结果显示观察到的增亮和模拟的增亮的关键几何和物理性质的分布相似。我们的结论是，非潜在的模拟可以成功地再现统计的EUV增亮的特性（通常具有超过85%的相似性），只有事件的持续时间是显着不同的观测和模拟。正在考虑根据太阳轨道器的高节奏和高分辨率磁图进行进一步研究，以提高观测和模拟之间的一致性。
The High Resolution Imager (HRIEUV) telescope of the Extreme Ultraviolet Imager (EUI) instrument onboard Solar Orbiter has observed EUV brightenings, so-called campfires, as fine-scale structures at coronal temperatures. The goal of this paper is to compare the basic geometrical (size, orientation) and physical (intensity, lifetime) properties of the EUV brightenings with regions of energy dissipation in a nonpotential coronal magnetic-field simulation. In the simulation, HMI line-of-sight magnetograms are used as input to drive the evolution of solar coronal magnetic fields and energy dissipation. We applied an automatic EUV-brightening detection method to EUV images obtained on 30 May 2020 by the HRIEUV telescope. We applied the same detection method to the simulated energy dissipation maps from the nonpotential simulation to detect simulated brightenings. We detected EUV brightenings with a density of brightenings/Mm2 in the EUI observations and simulated brightenings between – brightenings/Mm2 in the simulation, for the same time range. Although significantly more brightenings were produced in the simulations, the results show similar distributions of the key geometrical and physical properties of the observed and simulated brightenings. We conclude that the nonpotential simulation can successfully reproduce statistically the characteristic properties of the EUV brightenings (typically with more than 85% similarity); only the duration of the events is significantly different between observations and simulation. Further investigations based on high-cadence and high-resolution magnetograms from Solar Orbiter are under consideration to improve the agreement between observation and simulation.