论文标题
费米GBM X射线通量中的峰值峰值作为太阳耀斑加速度的探针
Subsecond Spikes in Fermi GBM X-ray Flux as a Probe for Solar Flare Particle Acceleration
论文作者
论文摘要
已知太阳耀斑会释放大量能量到加速电子中。在非热X射线通量中研究小时尺度（$ \ leq $ 2s）的波动提供了探测这些加速机制性质的机会。通过比较持续时间，能量带之间的时间差异以及这些尖峰的周期性与各种加速机制所要求的相关时间尺度的周期性，可以对每种机制的有效性进行测试。这项工作详细介绍了Fermi Gamma-ray爆发监视器（Fermi GBM）中快速波动的分析，该数据来自Sol21-07-30和Sol2011-08-04上的2 M9.3级太阳耀斑。这项研究表明，费米GBM数据是检查这些小时尺度尖峰的一种手段，并提出了一种严格的识别，计数和测量这些子代数X射线尖峰的时间特性的方法。在检查的2个耀斑中，我们发现峰值主要发生在冲动阶段的60-100秒中。相对尖峰强度范围从总数的5％到46％，具体取决于尖峰的能量带。平均尖峰持续时间为0.96秒和0.66秒，中位持续时间为0.79秒，而2叶子的平均持续时间为0.79和0.32秒。 Sol2011-08-04 Flare的峰值持续时间分布遵循-1.8 $ \ pm $ 0.5索引的电力法。在确定的3个尖峰间隔中，只有1个具有周期性，在1.7 $ \ pm $ 0.1 Hz频率下显示出明显的功率。
Solar flares are known to release a large amount of energy into accelerating electrons. Studying small timescale ($\leq$ 2s) fluctuations in nonthermal X-ray flux offers the opportunity to probe the nature of those acceleration mechanisms. By comparing the durations, differences in timing between energy bands, and the periodicity of these spikes against the relevant timescales called for by various acceleration mechanisms, a test for each mechanism's validity can be made. This work details the analysis of fast fluctuations in Fermi Gamma-ray Burst Monitor (Fermi GBM) data from 2 M9.3 class solar flares that occurred on SOL2011-07-30 and SOL2011-08-04. This study shows the usefulness of Fermi GBM data as a means of examining these small timescale spikes and presents a rigorous method of identifying, counting, and measuring the temporal properties of these subsecond X-ray spikes. In the 2 flares examined we found spikes to primarily occur in spans of 60-100 seconds in the impulsive phase. The relative spike intensity ranged from 5% to 46% of the total counts, depending on the energy band the spike was measured in. The average spike durations were 0.96 and 0.66 seconds and the median durations were 0.79 and 0.32 seconds for the 2 flares. The spike duration distribution for the SOL2011-08-04 flare was found to follow a power law with a -1.8 $\pm$ 0.5 index. Of the 3 spiking intervals identified, only 1 was found to have a periodicity, showing significant power at the 1.7 $\pm$ 0.1 Hz frequency.
