标题： 长时标耀斑辐射：冲动加热还是渐进加热？ 显示英文标题

标题： Long Duration Flare Emission: Impulsive or Gradual Heating?

摘要： X射线和EUV（极紫外）波段的耀发排放以前被建模为等离子体对磁重联引起的突发加热的响应。 一些耀发表现出逐渐演化的X射线和EUV光变曲线，这些曲线被认为是由发生在不同相邻环或甚至每个环内未解析细丝的一系列延长的突发加热事件的叠加所导致。 在本文中，我们将这种方法应用于由大气成像组件（AIA）观测到的长时间双带耀发SOL2011-09-13T22。 我们发现，为了与多EUV波段观测到的耀发发射特征相一致，每根细丝应该经历两阶段加热：一个强烈的突发加热，随后是一个持续20-30分钟且逐渐减弱的低速率加热尾迹。 每个AIA解析的单个环可能由几根这样的细丝组成。 两阶段加热情景得到了零维和一维流体动力学代码建模的支持。 我们讨论了重连后细丝中两阶段加热的可行物理机制。 显示英文摘要

摘要： Flare emissions in X-ray and EUV wavelengths have previously been modeled as the plasma response to impulsive heating from magnetic reconnection. Some flares exhibit gradually evolving X-ray and EUV light curves, which are believed to result from superposition of an extended sequence of impulsive heating events occurring in different adjacent loops or even unresolved threads within each loop. In this paper, we apply this approach to a long duration two-ribbon flare SOL2011-09-13T22 observed by the Atmosphere Imaging Assembly (AIA). We find that to reconcile with observed signatures of flare emission in multiple EUV wavelengths, each thread should be heated in two phases, an intense impulsive heating followed by a gradual, low-rate heating tail that is attenuated over 20-30 minutes. Each AIA resolved single loop may be composed of several such threads. The two-phase heating scenario is supported by modeling with both a zero-dimensional and a 1D hydrodynamic code. We discuss viable physical mechanisms for the two-phase heating in a post-reconnection thread.