标题： 活动区明亮热点在SDO/AIA的极紫外波段观测到的时间分辨发射以及多股环建模 显示英文标题

标题： Time-resolved emission from bright hot pixels of an active region observed in the EUV band with SDO/AIA and multi-stranded loop modeling

摘要： 在活动区中发现了少量非常热等离子体的证据，这可能是由于在比单个环的横截面更小的空间尺度上发生的脉冲加热。我们通过分析太阳动力学天文台上的大气成像组件在两个极紫外通道（94 A和335 A）中的最小分辨率元素的光曲线，研究了这样一个活动区核心中日冕环的加热和子结构。我们通过一种流体力学0D环模型（EBTEL）来模拟由纳米耀斑风暴加热的一束细丝的演化。从单根细丝的随机组合得到的光曲线与观测到的光曲线进行比较，无论是单个像素还是像素行，在两个通道中同时使用两种独立的方法：一个人工智能系统（概率神经网络，PNN）和一种简单的互相关技术。我们探索参数空间以限制热量脉冲的分布、持续时间和空间大小，并作为对数据的反馈，它们在光曲线上的特征。两种方法的最佳一致性是在一个相对较大的事件群体（1000个）中获得的，这些事件持续时间较短（小于1分钟），并且在有限的能量范围内具有相对较浅的分布（指数为1.5的幂律）。对数据的反馈表明，光曲线中的凸起，尤其是在94 A通道中，是几分钟前发生的加热过量的特征。 显示英文摘要

摘要： Evidence for small amounts of very hot plasma has been found in active regions and might be the indication of an impulsive heating, released at spatial scales smaller than the cross section of a single loop. We investigate the heating and substructure of coronal loops in the core of one such active region by analyzing the light curves in the smallest resolution elements of solar observations in two EUV channels (94 A and 335 A) from the Atmospheric Imaging Assembly on-board the Solar Dynamics Observatory. We model the evolution of a bundle of strands heated by a storm of nanoflares by means of a hydrodynamic 0D loop model (EBTEL). The light curves obtained from the random combination of those of single strands are compared to the observed light curves either in a single pixel or in a row of pixels, simultaneously in the two channels and using two independent methods: an artificial intelligent system (Probabilistic Neural Network, PNN) and a simple cross-correlation technique. We explore the space of the parameters to constrain the distribution of the heat pulses, their duration and their spatial size, and, as a feedback on the data, their signatures on the light curves. From both methods the best agreement is obtained for a relatively large population of events (1000) with a short duration (less than 1 min) and a relatively shallow distribution (power law with index 1.5) in a limited energy range (1.5 decades). The feedback on the data indicates that bumps in the light curves, especially in the 94 A channel, are signatures of a heating excess that occurred a few minutes before.