Interplanetary Type II Radio Bursts from Wind/WAVES and Sustained Gamma-Ray Emission from Fermi/LAT: Evidence for Shock Source
Interplanetary Type II Radio Bursts from Wind/WAVES and Sustained Gamma-Ray Emission from Fermi/LAT: Evidence for Shock Source
复制标题
风/波产生的行星际 II 型无线电爆发和费米/LAT 的持续伽马射线发射：激波源的证据
DOI：
10.3847/2041-8213/aaef36
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
R. Macdowall
中科院分区：
文献类型：
--
作者：
N. Gopalswamy;P. Makela;S. Yashiro;A. Lara;H. Xie;S. Akiyama;R. Macdowall
我们提出的定量证据表明，行星际II型射电爆发和持续的伽马射线发射（SGRE）事件从太阳是密切相关的。在Share等人报告的大约30个SGRE事件中，我们认为13个事件的持续时间超过15小时，以排除任何耀斑脉冲相伽马射线。SGRE持续时间也与突发的结束频率具有线性关系。SGRE和II型辐射的结束时间之间的同步性强有力地支持了这样的观点，即同一个冲击波加速电子产生II型爆发和质子（>300 MeV），质子从冲击波传播到太阳表面，通过π衰变产生SGRE。高能粒子的加速得到了在地球和（或）日地关系观测站航天器上探测到的相关太阳高能粒子事件的证实。此外，下面的日冕物质抛射（CME）具有与地面增强事件相同的性质，这一事实证实了300 MeV以上质子的存在：它们的速度>2000 km s−1，并且都是全晕CME。许多SEP事件在地球上没有可检测到的通量，在>300 MeV的能量通道，可能是因为磁连通性差。
We present quantitative evidence that interplanetary type II radio bursts and sustained gamma-ray emission (SGRE) events from the Sun are closely related. Out of about 30 SGRE events reported in Share et al. we consider 13 events that had a duration exceeding ∼5 hr to exclude any flare-impulsive phase gamma-rays. The SGRE duration also has a linear relation with the ending frequency of the bursts. The synchronism between the ending times of SGRE and the type II emission strongly supports the idea that the same shock accelerates electrons to produce type II bursts and protons (>300 MeV) that propagate from the shock to the solar surface to produce SGRE via pion decay. The acceleration of high-energy particles is confirmed by the associated solar energetic particle (SEP) events detected at Earth and/or at the Solar Terrestrial Relations Observatory spacecraft. Furthermore, the presence of >300 MeV protons is corroborated by the fact that the underlying coronal mass ejections (CMEs) had properties identical to those associated with ground-level enhancement events: they had speeds of >2000 km s−1 and all were full-halo CMEs. Many SEP events did not have detectable flux at Earth in the >300 MeV energy channels, presumably because of poor magnetic connectivity.