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arXiv 2001.03816astro-ph.SR
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2014年9月1日持续Gamma-ray事件中的高能质子源

Source of Energetic Protons in the 2014 September 1 Sustained Gamma-ray Emission Event

N. Gopalswamy, P. Mäkelä, S. Yashiro, H. Xie, S. Akiyama, N. Thakur

摘要:

我们报告了SOL 2014 -09-01持续伽马射线发射(SGRE)事件期间大于300 MeV质子的来源,该事件基于来自各种空间和地面仪器的多波长数据。基于喷发几何学,我们对喷发产生的γ射线辐射在时空上的扩展提供了具体的解释。我们发现,相关的磁绳是低倾角(大致在东西方向取向),这使得相关的冲击延伸到前侧。我们比较了SGRE源的质心与通量绳腿的位置,以推断高能质子必须沉淀在通量绳腿和冲击波阵面之间。SOL 2014 -09-01 SGRE事件和II型射电爆发的持续时间与持续时间超过3小时的其他SGRE事件获得的这些参数之间的线性关系一致。SEP事件的注量谱非常硬,表明该事件中存在高能(GeV)粒子。这进一步证实了高能日冕物质抛射(CME)的存在,速度超过2000公里/秒,类似于地面增强(GLE)事件。II型射电爆发的发射成分从米米到千米波长,与GLE事件相关。所有这些因素都表明,来自激波的高能粒子数量足够通过中性π介子衰变产生γ射线。

英文摘要:

We report on the source of greater than 300 MeV protons during the SOL2014-09-01 sustained gamma-ray emission (SGRE) event based on multi-wavelength data from a wide array of space- and ground-based instruments. Based on the eruption geometry we provide concrete explanation for the spatially and temporally extended γ-ray emission from the eruption. We show that the associated flux rope is of low inclination (roughly oriented in the east-west direction), which enables the associated shock to extend to the frontside. We compare the centroid of the SGRE source with the location of the flux rope leg to infer that the high-energy protons must be precipitating between the flux rope leg and the shock front. The durations of the SOL2014-09-01 SGRE event and the type II radio burst agree with the linear relationship between these parameters obtained for other SGRE events with duration exceeding 3 hrs. The fluence spectrum of the SEP event is very hard, indicating the presence of high-energy (GeV) particles in this event. This is further confirmed by the presence of an energetic coronal mass ejection (CME) with a speed more than 2000 km/s, similar to those in ground level enhancement (GLE) events. The type II radio burst had emission components from metric to kilometric wavelengths as in events associated with GLE events. All these factors indicate that the high-energy particles from the shock were in sufficient numbers needed for the production of γ-rays via neutral pion decay.

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