Pitch angle measurement method based on detector counts distribution. -I. basic conception

Chen-Wei Wang

doi:10.1007/s10686-025-10027-7

2025-11-13

PRE

DOI：10.1007/s10686-025-10027-7

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作为一款设计用于观测高能天体物理暂现源的X射线和伽马射线全天监视器，引力波高能电磁对应全天监视器（GECAM）也在低地球轨道上对伽马射线和粒子的暴发事件进行了一系列观测。投射角是围绕地磁场运动的带电粒子的关键参数之一。然而，使用全天监视器（GECAM式）仪器测量带电粒子投射角的应用仍显不足。在本工作中，我们提出了一种基于探测器计数分布的GECAM及类似仪器测量带电粒子投射角的新型方法，并介绍了该方法的基本概念及支持性模拟研究。通过该方法，GECAM-C探测到的某一特殊电子沉降事件的投射角被推导约为90°，证明了该方法的有效性。我们注意到，该方法在GECAM式仪器上的应用可能为研究空间粒子事件（如地球电子束TEBs和闪电诱发的电子沉降LEPs）开辟新的途径。

Keyword:

GECAM

Pitch angle

Geant4

Space environment

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Experimental Astronomy

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School of Computer and Information

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