冠状动脉环库存项目：扩展分析和结果
The Coronal Loop Inventory Project: Expanded Analysis and Results
摘要：
我们已经扩大了早期的工作，调查与等温$versus$多热交叉场温度分布的日冕环的相对重要性。这些结果是重要的，以确定如果环有未解决的磁股的形式的子结构。我们将温度分析的目标回路数量从19个增加到207个，并增加了来自多个区域的188个新回路。我们选择了大气成像组件（AIA）的171幅图像中所有可见的环路段，这些图像具有干净的背景。86个新的循环被拒绝，因为它们不能可靠地从其他AIA过滤器的背景中分离出来。61个环需要多热模型来重现观测结果。28个环是有效等温的，也就是说，AIA敏感的等离子体发射在不确定性内不能与等温发射区分开。10个环是等温的。我们的库存中还有一个小的火炬回路，一个温度分布不受AIA数据约束的非常冷的回路，以及一个结果不确定的回路。我们的调查可以证实一个意想不到的结果，从试点研究：我们发现没有等温环段，我们可以正确地使用171-193比的方法，这将是类似的分析所做的许多回路观察到的跟踪和EIT。我们建议那些假设环等离子体是等温的观察者要谨慎，并希望这些结果将影响日冕加热模型的方向和建模人员在各种加热场景上所花费的努力。
英文摘要：
We have expanded upon earlier work that investigates the relative importance of coronal loops with isothermal $versus$ multithermal cross-field temperature distributions. These results are important for determining if loops have substructure in the form of unresolved magnetic strands. We have increased the number of loops targeted for temperature analysis from 19 to 207 with the addition of 188 new loops from multiple regions. We selected all loop segments visible in the 171-Å images of the Atmospheric Imaging Assembly (AIA) that had a clean background. 86 of the new loops were rejected because they could not be reliably separated from the background in other AIA filters. 61 loops required multithermal models to reproduce the observations. 28 loops were effectively isothermal, that is, the plasma emission to which AIA is sensitive could not be distinguished from isothermal emission, within uncertainties. 10 loops were isothermal. Also part of our inventory were one small flaring loop, one very cool loop whose temperature distribution could not be constrained by the AIA data, and one loop with inconclusive results. Our survey can confirm an unexpected result from the pilot study: we found no isothermal loop segments where we could properly use the 171-to-193 ratio method, which would be similar to the analysis done for many loops observed with TRACE and EIT. We recommend caution to observers who assume the loop plasma is isothermal, and hope that these results will influence the direction of coronal heating models and the efforts modelers spend on various heating scenarios.
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