Temporal Evolution of Solar Energetic Particle Spectra
Temporal Evolution of Solar Energetic Particle Spectra
复制标题
太阳高能粒子光谱的时间演化
DOI：
10.1007/s11207-016-0956-4
复制
发表时间：
2016
期刊：
影响因子：
2.8
通讯作者：
S. Dalla
中科院分区：
文献类型：
--
作者：
D. Doran;S. Dalla
在太阳耀斑和日冕物质抛射期间，太阳高能粒子（SEP）可能会释放到行星际介质和近地位置。在1 Au的SEP事件的能量谱通常是平均在整个事件或在几个快照研究。在这篇文章中，我们分析了四个大的选择SEP事件的能量谱的时间演化使用大量的快照。我们使用多航天器和多仪器的方法进行观测，在很宽的SEP能量范围内获得。我们发现在不同的仪器测量的事件开始时的光谱有很大的差异。我们发现，随着时间的推移，观察到一个波浪状的结构，从最高能量到最低能量的光谱，创建一个“拱形”的形状，然后在事件发生后，在10小时左右的时间后，直变成幂律。我们讨论的过程，确定SEP强度和他们的作用，在塑造的光谱时间演变。
During solar flares and coronal mass ejections, Solar Energetic Particles (SEPs) may be released into the interplanetary medium and near-Earth locations. The energy spectra of SEP events at 1 AU are typically averaged over the entire event or studied in a few snapshots. In this article we analyze the time evolution of the energy spectra of four large selected SEP events using a large number of snapshots. We use a multi-spacecraft and multi-instrument approach for the observations, obtained over a wide SEP energy range. We find large differences in the spectra at the beginning of the events as measured by different instruments. We show that over time, a wave-like structure is observed traveling through the spectra from the highest energies to the lowest energies, creating an “arch” shape that then straightens into a power law later in the event, after times on the order of 10 hours. We discuss the processes that determine SEP intensities and their role in shaping the spectral time evolution.