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arXiv 1303.0977astro-ph.SR
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大型拱状耀斑硬X射线发射的准周期变化

Quasi-periodic Variations in the Hard X-ray emission of a Large Arcade Flare

Jerzy Jakimiec, Michal Tomczak

摘要:

本文利用1991年11月2日大耀斑的硬X射线(HXR)光变曲线和由Yohkoh X射线望远镜记录的软X射线和HXR图象,研究了HXR辐射的准周期振荡。对这些观测结果的分析结果如下:i)观测结果证实,电子在包含在尖点磁结构内的振荡磁阱中被加速。ii)HXR脉冲的幅度增加是由于磁阱振荡幅度的增加和色球蒸发上升流引起的磁阱内密度的增加。iii)当陷阱内密度的进一步增加抑制电子加速时,HXR脉冲幅度的增加终止。iv)振荡磁阱的模型能够解释电子沉淀的时间变化、加速电子沉淀的强不对称性以及15和25 keV电子沉淀的系统差异。我们已经获得了直接的观测证据,强HXR脉冲是来自色球蒸发的致密等离子体流入加速体积的结果。

英文摘要:

Quasi-periodic oscillations of the hard X-ray (HXR) emission of the large flare of 2 November 1991 have been investigated using HXR light curves and soft X-ray and HXR images recorded by the {\sl Yohkoh} X-ray telescopes. The results of the analysis of these observations are the following: i) The observations confirm that electrons are accelerated in oscillating magnetic traps which are contained within the cusp magnetic structure. ii) The amplitude of the HXR pulses increase due to the increase in the amplitude of the magnetic trap oscillations and the increase in the density within the traps caused by the chromospheric evaporation upflow. iii) The increase in the amplitude of the HXR pulses terminates when further increase in the density inside the traps inhibits the acceleration of electrons. iv) The model of oscillating magnetic traps is able to explain time variation of the electron precipitation, strong asymmetry in precipitation of accelerated electrons, and systematic differences in the precipitation of 15 and 25 keV electrons. v) We have obtained a direct observational evidence that strong HXR pulses are the result of the inflow of dense plasma coming from the chromospheric evaporation, into the acceleration volume.

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。

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