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Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012
Space Weather ( IF 4.288 ) Pub Date : 2020-11-09 , DOI: 10.1029/2020sw002626
A. L. Mishev 1, 2 , S. A. Koldobskiy 3 , I. G. Usoskin 1, 2 , L. G. Kocharov 2 , G. A. Kovaltsov 4
Affiliation  

Intense solar activity was observed in May 2012. A notable ground level enhancement (GLE) was registered on 17 May 2012 by several space‐borne instruments as well as on ground by neutron monitors (NMs). This event is known as GLE # 71. Here, we derived the spectral and angular characteristics, and apparent source position of the solar protons during the GLE # 71, employing verified newly computed NM yield function and sophisticated unfolding procedure. We considerably improved the previously derived information about the spectra and angular distribution, namely, the precision, time span, and time resolution of the derived characteristics, specifically during the event onset and late phase. A comparison with direct measurements, with the Payload for Antimatter Matter Exploration and Light‐nuclei Astrophysics (PAMELA) experiment, of the particle fluence was performed, and good agreement between NM and direct space‐borne data analysis was achieved. Subsequently, we computed the effective dose rates in the polar region at several altitudes during the event using the derived rigidity spectra of the solar protons as a reliable input for the corresponding radiation model. The contribution of the galactic cosmic rays and solar protons to the exposure is explicitly considered. We computed the integrated exposure during the event and discussed the exposure of crew members/passengers to radiation at several altitudes.

中文翻译:

经过验证的中子监测仪屈服函数在2012年5月17日对GLE#71的扩展分析中的应用

2012年5月观测到强烈的太阳活动。2012年5月17日,几台航天器以及中子监测器(NMs)在地面上进行了显着的地面增强(GLE)。此事件称为GLE 71。在这里,我们得出了GLE 期间太阳质子的光谱和角度特征以及视在源位置如图71所示,采用经验证的新计算出的NM屈服函数和复杂的展开过程。我们极大地改善了先前派生的有关光谱和角度分布的信息,即派生特性的精度,时间跨度和时间分辨率,特别是在事件开始和后期。进行了与反物质有效载荷和光核天体物理学(PAMELA)实验的直接测量的比较,对粒子的能量通量进行了分析,并获得了NM与直接星载数据分析之间的良好一致性。随后,我们使用太阳质子的刚度光谱作为相应辐射模型的可靠输入,计算了事件期间在几个海拔高度的极地区域的有效剂量率。明确考虑了银河系宇宙射线和太阳质子对暴露的贡献。我们计算了活动期间的综合暴露量,并讨论了机组人员/乘客在几种高度下的辐射暴露。
更新日期:2020-11-09
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