Energy Transport in Solar Flares

在过去的几年里，在很大程度上，由于 从航天器观测站获取数据， 美国航天局太阳活动最大期使命任务和日本的Hinotori，a 太阳耀斑脉冲阶段的全球图像已经开始 其中不同区域的辐射特征 光谱区域都被认为反映了相同的底层 物理过程。 太空船的数据显示硬X射线 源在时间和空间上以一种 与预测的大气对耀斑的反应一致 高能电子碰撞退化能量输入 梁。 软X射线中的谱线轮廓揭示了等离子体 排放量和速度， 这些电子束能量传输的预测 计算出了这里资助的团体。 这些结果和其他结果令人鼓舞，因为 在很宽的波长范围内进行观测， 来解决太阳耀斑的两个最基本的问题 物理学-主要能量释放的性质和原因，以及 能量传输过程的物理学。 的相互作用 理论和观察之间的联系已经远远超出了 简单的定性图片比较。 我们现在处于一个阶段 理论预测可以用来完善理论 模型，从而增加我们对基础物理学的理解， 工作 这笔赠款将支持一项工作计划，以继续这一 盈利分析。 它将解决诊断问题 耀斑能量传输过程，特别是由 超热电子的加速和退化， 硬X射线、软X射线和EUV。 此外还将 批判性地研究能量释放的物理学， 在耀斑的脉冲阶段的这样一幅图像中， 改进现有模型，以包括迄今为止 只有很少的关注，如反向电流，等离子体 集体过程和非均匀磁场几何形状。

Over the past few years, in great part due to the acquisition of data from spacecraft observatories such as the NASA Solar Maximum Mission (SMM) and the Japanese Hinotori, a global picture of the impulsive phase of solar flares has started to emerge, in which the radiation signatures in different spectral regions are all seen to reflect the same underlying physical processes. The spacecraft data show that the hard X-ray source evolves temporally and spatially in a manner which is consistent with the predicted response of the atmosphere to flare energy input by collisional degradation of energetic electron beams. Spectral line profiles in soft X-rays reveal plasma emission measures and velocities which are broadly consistent with the predictions of these electron beam energy transport calculations of the group funded here. These and other results are encouraging, because observations over a wide range of wavelengths can indeed be used to address two of the most fundamental questions of solar flare physics - the nature and cause of the primary energy release, and the physics of the energy transport processes. The interplay between theory and observation has progressed well beyond a simple comparison of qualitative pictures. We are now at a stage where theoretical predictions can be used to refine theoretical models and so increase our understanding of the basic physics at work. This grant will support a program of work to continue this profitable line of analysis. It will address diagnostics of flare energy transport processes, notably those resulting from the acceleration and degradation of suprathermal electrons, in hard X-rays, soft X-rays, and EUV. In addition, it will critically examine the physics of the energy release and transport in such a picture of the impulsive phase of flares, refining existing models to include effects which have hitherto received only scant attention, such as reverse currents, plasma collective processes and non-uniform magnetic field geometry.