Downflow Motions Associated with Impulsive Nonthermal Emissions Observed in the 2002 July 23 Solar Flare
Downflow Motions Associated with Impulsive Nonthermal Emissions Observed in the 2002 July 23 Solar Flare
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DOI：
10.1086/420768
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
A. Asai;T. Yokoyama;M. Shimojo;K. Shibata
中科院分区：
文献类型：
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作者：
A. Asai;T. Yokoyama;M. Shimojo;K. Shibata
我们提出了一个详细的检查，在2002年7月23日耀斑环观测到的下行流运动。用过渡区和日冕探测器获得的极紫外图像显示了耀斑后环上方的暗下流运动（向阳运动），不仅在衰变阶段，而且在脉冲和主阶段。我们还发现，向下流动开始出现的时间对应于硬X射线和微波中非热辐射爆发的时间。这一结果意味着，当强磁能被释放时，向下流动运动发生，它们是重联流出，或与之相关。
We present a detailed examination of downflow motions above flare loops observed in the 2002 July 23 flare. The extreme-ultraviolet images obtained with the Transition Region and Coronal Explorer show dark downflow motions (sunward motions) above the postflare loops, not only in the decay phase but also in the impulsive and main phases. We also found that the times when the downflow motions start to be seen correspond to the times when bursts of nonthermal emissions in hard X-rays and microwaves are emitted. This result implies that the downflow motions occurred when strong magnetic energy was released and that they are, or are correlated with, reconnection outflows.