arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.04031astro-ph.SRastro-ph.HEphysics.space-ph
收藏

日冕中的小电子加速事件

Small electron acceleration episodes in the solar corona

Tomin James, Prasad Subramanian, Eduard P Kontar

摘要:

我们研究了日冕中小加速事件产生的非热电子的能量学。我们在2004- 2015年进行了广泛的调查,并在1 AU处检测到6个脉冲电子事件,这些事件与大型太阳耀斑(GOES软X射线类$>$ C1)或日冕物质抛射无关。这些事件中的每一个都有微弱的,但可检测到的硬X射线(HXR)发射靠近西翼,并与行星际III型爆发。在某些方面,这些事件似乎是“冷/脆弱”耀斑的弱对应物。产生HXR的电子群体携带的能量为$\approx 10^{23}$ -- $10^{25}$ erg,而在1 AU处检测到的相应群体携带的能量为$\approx 10^{24}$ -- $10^{25}$ erg。逃离日冕加速点并达到1 AU的电子数量占向下沉淀产生厚靶HXR发射的电子数量的6%至148%。

英文摘要:

We study the energetics of nonthermal electrons produced in small acceleration episodes in the solar corona. We carried out an extensive survey spanning 2004--2015 and shortlisted 6 impulsive electron events detected at 1 AU that was not associated with large solar flares(GOES soft X-ray class $>$ C1) or with coronal mass ejections. Each of these events had weak, but detectable hard Xray (HXR) emission near the west limb, and were associated with interplanetary type III bursts. In some respects, these events seem like weak counterparts of "cold/tenuous" flares. The energy carried by the HXR producing electron population was $\approx 10^{23}$ -- $10^{25}$ erg, while that in the corresponding population detected at 1 AU was $\approx 10^{24}$--$10^{25}$ erg. The number of electrons that escape the coronal acceleration site and reach 1 AU constitute 6 % to 148 % of those that precipitate downwards to produce thick target HXR emission.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑