TIME-RESOLVED EMISSION FROM BRIGHT HOT PIXELS OF AN ACTIVE REGION OBSERVED IN THE EUV BAND WITH SDO/AIA AND MULTI-STRANDED LOOP MODELING
TIME-RESOLVED EMISSION FROM BRIGHT HOT PIXELS OF AN ACTIVE REGION OBSERVED IN THE EUV BAND WITH SDO/AIA AND MULTI-STRANDED LOOP MODELING
复制标题
使用 SDO/AIA 和多链环路建模在 EUV 波段观察到的活动区域明亮热像素的时间分辨发射
DOI：
10.3847/0004-637x/816/1/12
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发表时间：
2015
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通讯作者：
P. Testa
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作者：
E. Tajfirouze;F. Reale;A. Petralia;P. Testa
在活跃区域发现了少量非常热的等离子体的证据，这可能是在小于单个环的横截面的空间尺度上释放的脉冲加热的指示。我们调查的加热和子结构的日冕环在这样的活动区域的核心，通过分析在两个EUV通道（94和335毫米）从大气成像组件上的太阳动力学观测的最小分辨率元素的光变曲线。我们通过流体动力学0D回路模型（EBTEL）模拟了一束由纳米耀斑风暴加热的股线的演化。从单链的随机组合获得的光变曲线与在单个像素或一行像素中观察到的光变曲线进行比较，同时在两个通道中，并使用两种独立的方法：人工智能系统（概率神经网络）和简单的互相关技术。我们探索的参数空间，以约束热脉冲的分布，其持续时间，其空间大小，并作为对数据的反馈，其签名的光变曲线。从这两种方法的最佳协议是获得一个相对较大的人口的事件（1000），持续时间短（小于1分钟）和一个相对较浅的分布（指数为1.5的幂律）在有限的能量范围内（1.5十年）。对数据的反馈表明，光变曲线中的凸起，特别是在94 ° C的通道中，是几分钟前发生的过度加热的标志。
Evidence of small amounts of very hot plasma has been found in active regions and might be an indication of 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 and 335 Å) 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 a 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) and a simple cross-correlation technique. We explore the space of the parameters to constrain the distribution of the heat pulses, their duration, 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 minute) 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 Å channel, are signatures of a heating excess that occurred a few minutes before.
J.H.物理化学研究所/查尔斯大学（捷克共和国）
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