Abstract

Based on the model of a collapsing magnetic trap, we consider the influence of the temperature of a Maxwellian flare plasma on the efficiency of the betatron acceleration of quasi-thermal fast electrons in the cusp region of coronal loops. We show that an increase in the temperature causes a sharp growth (by 6–8 orders of magnitude) in the number density of quasi-thermal electrons which are capable of overcoming the ‘‘Coulomb loss barrier.’’ This suggests the necessity of background plasma preheating in the cusp region to \({\gtrsim}10\) MK, for which the betatron mechanism can be responsible. We discuss the connection between the impulsive phase of flare energy release and the X-ray precursors of solar flares.

中文翻译：

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太阳耀斑中准热电子的碰撞等离子体温度和电子感应加速器加速

摘要

基于塌缩磁阱模型，我们考虑了麦克斯韦耀斑等离子体的温度对日冕环尖点区准热快电子电子感应加速器加速效率的影响。我们表明，温度的升高会导致准热电子的数量密度急剧增长（6-8 个数量级），从而能够克服“库仑损失势垒”。这表明背景研究的必要性尖点区域的等离子体预热到\({\gtrsim}10\) MK，电子感应加速器机制可以对此负责。我们讨论耀斑能量释放的脉冲阶段与太阳耀斑的 X 射线前兆之间的联系。