Pre-Flare Flows in the Corona

Pre-Flare Flows in the Corona
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日冕中的前耀斑流

DOI:
10.1007/s11207-010-9661-x
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发表时间:
2010
期刊:
影响因子:
2.8
通讯作者:
S. Matthews
S. Matthews
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
A. Wallace;L. Harra;L. Driel;L. Green;S. Matthews

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太阳耀斑发生在强磁场区域,通常被认为是电阻性不稳定导致磁重联的结果。当新的通量出现在一个已经存在的活跃区域时,它可以作为耀斑和日冕物质抛射的触发器。在本次研究中,我们观测了10955活动区在磁逆行出现小范围附加磁通后的情况。我们发现,当额外的正通量水平超过1.38×1020 Mx(麦克斯韦)时,在初始通量出现后大约7小时,耀斑开始出现。我们集中研究了第二天发生的一次b级耀斑的前活动。最早的活动迹象是在耀斑爆发前一小时非热速度的上升。在耀斑开始前40分钟,在日冕的两个环系统上观测到增亮和耀斑前流,包括新通量和先前的活跃区环。我们讨论了在耀斑爆发之前,新通量和先前存在的环之间的重新连接通过在新重新连接的环之间产生慢模磁声波或压力梯度来驱动流的可能性。随后的b级耀斑起源于与耀斑前流相同的回路系统的快速重新连接。
Solar flares take place in regions of strong magnetic fields and are generally accepted to be the result of a resistive instability leading to magnetic reconnection. When new flux emerges into a pre-existing active region it can act as a flare and coronal mass ejection trigger. In this study we observed active region 10955 after the emergence of small-scale additional flux at the magnetic inversion line. We found that flaring began when additional positive flux levels exceeded 1.38×1020 Mx (maxwell), approximately 7 h after the initial flux emergence. We focussed on the pre-flare activity of one B-class flare that occurred on the following day. The earliest indication of activity was a rise in the non-thermal velocity one hour before the flare. 40 min before flaring began, brightenings and pre-flare flows were observed along two loop systems in the corona, involving the new flux and the pre-existing active region loops. We discuss the possibility that reconnection between the new flux and pre-existing loops before the flare drives the flows by either generating slow mode magnetoacoustic waves or a pressure gradient between the newly reconnected loops. The subsequent B-class flare originated from fast reconnection of the same loop systems as the pre-flare flows.
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