扩散碰撞输运模型中高能电子的能量沉积
Energy Deposition by Energetic Electrons in a Diffusive Collisional Transport Model
摘要：
在太阳耀斑中，相当大一部分能量以超热电子的形式释放;这些电子在环境大气中的能量沉积中起着重要作用，因此大气对耀斑加热的反应也是如此。从历史上看，这些粒子的传输已经近似通过一个确定性的方法，其中一阶长期的能量损失的电子在周围的目标被视为占主导地位的影响，与二阶扩散条款（在能量和角度）一般被视为一个小的修正或忽略。然而，最近有人指出，虽然忽略扩散的能量确实可以忽略不计，扩散的角度是相同的顺序确定性散射，因此必须包括在内。因此，在这里，我们调查的角散射的效果上的能量沉积轮廓在燃烧的大气。一个相对简单的紧凑的表达到环境等离子体的能量沉积的空间分布，并与相应的确定性结果进行比较。对于单向注射有一个显着的转变，在加热从较低的电晕到较高的电晕，这种转变是小得多的各向同性注射。我们还比较了由于返回电流欧姆加热在扩散和确定性模型的加热配置文件。
英文摘要：
A considerable fraction of the energy in a solar flare is released as suprathermal electrons; such electrons play a major role in energy deposition in the ambient atmosphere and hence the atmospheric response to flare heating. Historically the transport of these particles has been approximated through a deterministic approach in which first-order secular energy loss to electrons in the ambient target is treated as the dominant effect, with second-order diffusive terms (in both energy and angle) being generally either treated as a small correction or neglected. However, it has recently been pointed out that while neglect of diffusion in energy may indeed be negligible, diffusion in angle is of the same order as deterministic scattering and hence must be included. Here we therefore investigate the effect of angular scattering on the energy deposition profile in the flaring atmosphere. A relatively simple compact expression for the spatial distribution of energy deposition into the ambient plasma is presented and compared with the corresponding deterministic result. For unidirectional injection there is a significant shift in heating from the lower corona to the upper corona; this shift is much smaller for isotropic injection. We also compare the heating profiles due to return current Ohmic heating in the diffusional and deterministic models.
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