Abstract

This work investigates the relationship between cosmic ray intensity (CRI) and key interplanetary and geomagnetic parameters during both disturbed (November 1–6, 2021) and quiet (November 7–12, 2021) periods. Four neutron monitor stations, namely BKSN, DOMC, JUNG, and MXCO, are employed to analyze the behavior of CRI in response to variations in southward interplanetary magnetic field (IMF Bz), interplanetary electric field (IEF Ey), solar wind speed (Vsw), and geomagnetic indices, including Kp and Dst. During the storm period, time series plots reveal significant Forbush Decreases (FD) in CRI at all stations. These FDs exhibit distinct characteristics, with the most substantial reduction observed at high-latitude stations and the least at low-latitude stations. Notably, the Mexico station, situated in the low-latitude region, records higher neutron counts for both disturbed and quiet periods compared to the middle (BKSN and JUNG) and high-latitude (DOMC) stations. Cross-correlation analysis is employed to examine the relationships between CRI and the aforementioned parameters. Results indicate that during the geomagnetically disturbed period, CRI exhibits negative correlations with IMF Bz, Vsw, and Kp index, while demonstrating positive correlations with Dst and IEF Ey. The strongest correlation is observed between CRI and Dst, suggesting that it can affect variations in cosmic rays measured on Earth, during the geomagnetic storms. In contrast, during the quiet period, significantly weaker correlation was observed than the disturbed period. However, at the JUNG station, CRI displays good correlations with all considered parameters even during the quiet period. The station-specific correlations signifies the importance of geographic location in shaping the response of CRI to external influences.

中文翻译：

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扰动和安静时期宇宙线强度与行星际和地磁参数的互相关分析

摘要

这项工作研究了扰动（2021年11月1日至6日）和安静（2021年11月7日至12日）期间宇宙射线强度（CRI）与关键行星际和地磁参数之间的关系。四个中子监测站，即 BKSN、DOMC、JUNG 和 MXCO，用于分析 CRI 对南向行星际磁场 (IMF Bz )、行星际电场 (IEF Ey )、太阳风速 ( Vsw ) 变化的响应) 和地磁指数，包括Kp和Dst。在风暴期间，时间序列图显示所有台站的 CRI 均出现显着的福布什下降 (FD)。这些 FD 表现出独特的特征，在高纬度站观察到的减少幅度最大，而在低纬度站观察到的减少幅度最小。值得注意的是，与中纬度（BKSN 和 JUNG）和高纬度（DOMC）站相比，位于低纬度地区的墨西哥站在扰动和安静时期记录到的中子数更高。采用互相关分析来检查 CRI 与上述参数之间的关系。结果表明，地磁扰动期间，CRI与IMF Bz、Vsw、Kp指数呈负相关，与Dst、IEF Ey呈正相关。在 CRI 和Dst之间观察到最强的相关性，这表明它可以影响地磁风暴期间在地球上测量的宇宙射线的变化。相反，在安静时期，观察到的相关性明显弱于受干扰时期。然而，在 JUNG 站，即使在安静时期，CRI 也与所有考虑的参数显示出良好的相关性。特定电台的相关性表明地理位置在影响 CRI 对外部影响的响应方面的重要性。