During Solar Cycle 23 16 ground-level enhancement events were registered by the global neutron monitor network. In this work we focus on the period with increased solar activity during late October – early November 2003 producing a sequence of three events, specifically on ground-level enhancement GLE 67 on 2 November 2003. On the basis of an analysis of neutron monitor and space-borne data we derived the spectra and pitch-angle distribution of high-energy solar particles with their dynamical evolution throughout the event. According to our analysis, the best fit of the spectral and angular properties of solar particles was obtained by a modified power-law rigidity spectrum and a double Gaussian, respectively. The derived angular distribution is consistent with the observations where an early count rate increase at Oulu neutron monitor with asymptotic viewing direction in the anti-Sun direction was registered. The quality of the fit and model constraints were assessed by a forward modeling. The event integrated particle fluence was derived using two different methods. The derived results are briefly discussed.

在太阳周期23期间，全球中子监测网络记录了16次地平面增强事件。在这项工作中，我们重点关注2003年10月下旬至11月上旬太阳活动增加的时期，产生了三个事件，特别是2003年11月2日地面增强GLE67。基于对中子监测器和空间的分析实测数据，我们得出了高能太阳能粒子在整个事件中的动态演变及其光谱和俯仰角分布。根据我们的分析，分别通过修改的幂律刚度谱和双高斯谱获得了太阳粒子的光谱和角度特性的最佳拟合。导出的角度分布与观察结果一致，在该观察结果中，在Oulu中子监测器上以反太阳方向渐近观察方向记录了早期计数率的增加。拟合和模型约束的质量通过正向建模进行评估。使用两种不同的方法得出事件积分的粒子通量。简要讨论了得出的结果。