A Hierarchical Relationship between the Fluence Spectra and CME Kinematics in Large Solar Energetic Particle Events: A Radio Perspective
A Hierarchical Relationship between the Fluence Spectra and CME Kinematics in Large Solar Energetic Particle Events: A Radio Perspective
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大型太阳高能粒子事件中注量谱与日冕物质抛射运动学之间的层次关系：射电视角
DOI：
10.1088/1742-6596/900/1/012009
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Xie
中科院分区：
文献类型：
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作者：
N. Gopalswamy;P. Makela;S. Yashiro;N. Thakur;S. Akiyama;H. Xie
我们报告了太阳高能粒子由日冕物质抛射（CME）的运动学特性组织的进一步证据[1]。特别是，我们专注于II型爆发的起始频率，这是有关的无线电发射开始从太阳的距离。我们发现，三组太阳高能粒子（SEP）事件已知有不同的CME初始加速度值，也有不同的平均起始频率的相关的II型爆发。SEP事件与地面水平的增强（GLE）有最高的起始频率（107 MHz），而那些与灯丝喷发（FE）在静止区有最低的起始频率（22 MHz）;定期SEP事件有中间的起始频率（81 MHz）。以II型爆发的起始时间作为激波形成的时间，我们确定了从太阳中心测量的激波形成高度。我们发现，地震形成的平均最近的太阳（1.51 Rs）在GLE事件，最远的太阳在FE SEP事件（5.38 Rs），和中间距离的定期SEP事件（1.72 Rs）。最后，我们提出了一个案例研究的结果CME与高初始加速度（103公里s-2）和II型无线电爆发具有高起始频率（10200 MHz），但与一个小SEP事件。我们发现，通量谱指数和CME初始加速度之间的关系继续举行，即使是这个小SEP事件。
We report on further evidence that solar energetic particles are organized by the kinematic properties of coronal mass ejections (CMEs)[1]. In particular, we focus on the starting frequency of type II bursts, which is related to the distance from the Sun where the radio emission starts. We find that the three groups of solar energetic particle (SEP) events known to have distinct values of CME initial acceleration, also have distinct average starting frequencies of the associated type II bursts. SEP events with ground level enhancement (GLE) have the highest starting frequency (107 MHz), while those associated with filament eruption (FE) in quiescent regions have the lowest starting frequency (22 MHz); regular SEP events have intermediate starting frequency (81 MHz). Taking the onset time of type II bursts as the time of shock formation, we determine the shock formation heights measured from the Sun center. We find that the shocks form on average closest to the Sun (1.51 Rs) in GLE events, farthest from the Sun in FE SEP events (5.38 Rs), and at intermediate distances in regular SEP events (1.72 Rs). Finally, we present the results of a case study of a CME with high initial acceleration (∼3 km s-2) and a type II radio burst with high starting frequency (∼200 MHz) but associated with a minor SEP event. We find that the relation between the fluence spectral index and CME initial acceleration continues to hold even for this minor SEP event.