X-Ray Loop-Top Source Generated by Processes in a Flare Collapsing Trap
X-Ray Loop-Top Source Generated by Processes in a Flare Collapsing Trap
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DOI：
10.1086/505460
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
M. Karlický;M. Bárta
中科院分区：
文献类型：
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作者：
M. Karlický;M. Bárta
利用磁重联的二维MHD模型，模拟了具有坍缩陷阱的尖点结构。将这些计算结果换算到太阳耀斑条件下，我们研究了坍缩陷阱中的电子加速。我们使用的测试粒子技术与引导中心近似，其中包括碰撞损失和散射的加速电子。我们发现，这个“二次”加速过程从根本上改变了在重联过程中预加速的电子的分布函数。塌缩阱是一个具有回流的结构，它影响着环顶X射线源的空间结构。证实了电子在电场方向上的曲率漂移对电子加速的重要性。加速更有效，X射线环顶源更强烈，但空间上比没有这种漂移的模型中计算的X射线源更长。
Using the two-dimensional MHD model of the magnetic reconnection, the cusp structure with the collapsing trap is simulated. Scaling these computational results into solar flare conditions, we study the electron acceleration in the collapsing trap. We use the test-particle technique with the guiding center approximation in which the collisional losses and scattering of accelerated electrons are included. We found that this "secondary" acceleration process essentially modifies the distribution function of electrons preaccelerated in the reconnection process. The collapsing trap consists of a structure with the return current, which influences the spatial structure of the loop-top X-ray source. The significance of the curvature drift of electrons in the electric field direction for the electron acceleration is confirmed. The acceleration is more efficient, and the X-ray loop-top source is more intense, but spatially more prolonged than the X-ray source computed in the model without this drift.