标题： 横场热传导的显著性和耀斑精细结构 显示英文标题

标题： Prominence and flare fine structure from cross-field thermal conduction

摘要： 与沿磁场方向的导热相比，跨磁场方向的导热被强烈抑制。 然而，如果耀斑是通过沿着磁场方向的高细丝状束加热的，那么耀斑横截面中的加热单元阵列将导致较小的空间尺度（从而产生较大的温度梯度）以及加热体积的大表面积，从而提供总跨场能量通量的几何增强。 为了研究这种细丝状几何结构的重要性，我们提出一个简单的模型，即一个被光学薄辐射壳包围的单个加热细丝，得到壳体内稳定平衡温度分布的解析表达式，并利用此来限定该模型适用的细丝大小。 我们发现，仅凭这一机制就足以传输与大耀斑同量级的功率，在中等范围的细丝尺寸下有效。 这些长度尺度明显小于目前可分辨的尺度，尽管它们应被视为低估。 显示英文摘要

摘要： Thermal conduction across a magnetic field is strongly suppressed compared with conduction along the field. However, if a flare is heated by a highly filamented beam directed along the field, then the array of heated cells in a cross-section of the flare will result in both small spatial scales (with consequently large temperature gradients) and a large surface area for the heated volume, providing a geometrical enhancement of the total cross-field energy flux. To investigate the importance of this filamentary geometry, we present a simple model of a single heated filament surrounded by an optically thin radiating shell, obtain an analytical expression for the stable equilibrium temperature profile within the shell, and use this to impose limits on the size of filament for which this model is appropriate. We find that this mechanism by itself is capable of transporting a power of the same order as a large flare, with a moderate range of filament sizes. The length scales are substantially smaller than can be resolved at present, although they should be regarded as underestimates.