Abstract

Galactic cosmic rays entering heliosphere are modulated by interplanetary magnetic field which is carried away from the Sun by the solar wind. Cosmic rays are additionally modulated by coronal mass ejections and shock waves, which can produce Forbush decrease, a transient decrease in the observed galactic cosmic ray intensity. Measurements of magnetic field and plasma parameters in near-Earth space detect regularly coronal mass ejections, so it is important to understand the correlation between near-Earth particles fluxes associated with these coronal mass ejections and Forbush decreases. By combining in situ measurements of solar energetic particles with ground-based observations by the Belgrade muon detector, we analysed the dynamics of the variation of galactic cosmic rays. Correlation between variations of the flux of the cosmic rays and average in situ particle fluxes was investigated during Forbush decreases. Correlation exhibited dependence on the energy of solar wind particles, but also on cut-off rigidities of cosmic rays detected on the ground. The goal of cross-correlation analysis is to help in better understanding of how coronal mass ejections affect space weather as well as the effects they have on primary cosmic ray variations as detected by ground-based cosmic ray detectors.

Graphic abstract

中文翻译：

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太阳高能粒子与二次宇宙线通量的相关分析

摘要

进入日光层的银河宇宙射线受到行星际磁场的调制，该磁场被太阳风从太阳带走。宇宙射线还受到日冕物质抛射和冲击波的调制，这会产生福布什衰减，即观测到的银河宇宙射线强度的瞬时下降。近地空间磁场和等离子体参数的测量会定期检测到日冕物质抛射，因此了解与这些日冕物质抛射相关的近地粒子通量与福布什衰减之间的相关性非常重要。通过将太阳高能粒子的原位测量与贝尔格莱德 μ 子探测器的地面观测相结合，我们分析了银河宇宙射线变化的动力学。在 Forbush 下降期间，研究了宇宙射线通量变化与平均原位粒子通量之间的相关性。相关性表现出依赖于太阳风粒子的能量，但也依赖于在地面上检测到的宇宙射线的截止刚度。互相关分析的目标是帮助更好地了解日冕物质抛射如何影响空间天气以及它们对地面宇宙射线探测器探测到的初级宇宙射线变化的影响。

图形摘要