活动区堆芯中X射线环和EUV“Moss”的建模
Modeling X-ray Loops and EUV "Moss" in an Active Region Core
摘要：
软X射线强度的活动区核心和相应的脚点，或苔藓，强度在EUV观察几个小时保持稳定。发射的稳定性促使许多人提出，这些环路中的加热也必须是稳定的，尽管还没有将观测到的X射线和EUV强度与流体动力学方程的稳定加热解进行直接比较。在本文中，我们进行这些模拟，并同时模拟X射线和EUV苔藓强度在一个活跃的区域核心与稳定的均匀加热。为了执行这项任务，我们引入了一种新的技术来约束模型参数，使用测量的EUV足迹强度来推断加热速率。我们发现，8%的填充因子和随高度扩展的环提供了与两个X射线滤波器中的强度的最佳一致性，尽管模拟的SXT Al 12强度是观察到的强度的147%，SXT AlMg强度是观察到的强度的80%。根据该解，我们确定所需的加热速率标度为${\bar{B}}^{0.29} L^{-0.95}$。最后，我们讨论了这种类型的建模的未来潜力，如使用密度测量，以充分约束填充因子的能力，以及它的缺点，如需要使用势场外推近似的日冕场。
英文摘要：
The Soft X-ray intensity of loops in active region cores and corresponding footpoint, or moss, intensity observed in the EUV remain steady for several hours of observation. The steadiness of the emission has prompted many to suggest that the heating in these loops must also be steady, though no direct comparison between the observed X-ray and EUV intensities and the steady heating solutions of the hydrodynamic equations has yet been made. In this paper, we perform these simulations and simultaneously model the X-Ray and EUV moss intensities in one active regioncore with steady uniform heating. To perform this task, we introduce a new technique to constrain the model parameters using the measured EUV footpoint intensity to infer a heating rate. We find that a filling factor of 8% and loops that expand with height provides the best agreement with the intensity in two X-ray filters, though the simulated SXT Al12 intensity is 147% the observed intensity and the SXT AlMg intensity is 80% the observed intensity. From this solution, we determine the required heating rate scales as ${\bar{B}}^{0.29} L^{-0.95}$. Finally we discuss the future potential of this type of modeling, such as the ability to use density measurements to fully constrain filling factor, and its shortcomings, such as the requirement to use potential field extrapolations to approximate the coronal field.
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