Cross-Correlation Analysis of Cosmic Ray Intensity with Interplanetary and Geomagnetic Parameters during Disturbed and Quiet Periods

IF 0.6 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Cosmic Research Pub Date : 2024-03-08 DOI:10.1134/s0010952523600075
Chali Idosa Uga, Sujan Prasad Gautam, Ephrem Beshir Seba
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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.

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扰动期和静止期宇宙线强度与行星际参数和地磁参数的交叉相关分析
摘要 本研究调查了扰动期(2021年11月1-6日)和静止期(2021年11月7-12日)宇宙射线强度(CRI)与关键行星际和地磁参数之间的关系。利用四个中子监测站,即BKSN、DOMC、JUNG和MXCO,分析宇宙射线强度(CRI)随行星际磁场(IMF Bz)、行星际电场(IEF Ey)、太阳风速度(Vsw)和地磁指数(包括Kp和Dst)的变化而变化的行为。在风暴期间,时间序列图显示所有站点的 CRI 都出现了明显的福布什下降 (FD)。这些 FD 表现出明显的特征,高纬度台站的降幅最大,低纬度台站的降幅最小。值得注意的是,与中纬度台站(BKSN 和 JUNG)和高纬度台站(DOMC)相比,位于低纬度地区的墨西哥台站在扰动期和平静期记录的中子计数都较高。交叉相关分析用于研究 CRI 与上述参数之间的关系。结果表明,在地磁扰动期间,CRI 与 IMF Bz、Vsw 和 Kp 指数呈负相关,而与 Dst 和 IEF Ey 呈正相关。在 CRI 与 Dst 之间观察到的相关性最强,这表明在地磁暴期间,它可能会影响地球上测量到的宇宙射线的变化。相比之下,在静止期观测到的相关性明显弱于扰动期。然而,在琼格站,即使在静止期,CRI 与所有考虑的参数都显示出良好的相关性。特定台站的相关性表明地理位置在影响 CRI 对外部影响的反应方面的重要性。
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来源期刊
Cosmic Research
Cosmic Research 地学天文-工程:宇航
CiteScore
1.10
自引率
33.30%
发文量
41
审稿时长
6-12 weeks
期刊介绍: Cosmic Research publishes scientific papers covering all subjects of space science and technology, including the following: ballistics, flight dynamics of the Earth’s artificial satellites and automatic interplanetary stations; problems of transatmospheric descent; design and structure of spacecraft and scientific research instrumentation; life support systems and radiation safety of manned spacecrafts; exploration of the Earth from Space; exploration of near space; exploration of the Sun, planets, secondary planets, and interplanetary medium; exploration of stars, nebulae, interstellar medium, galaxies, and quasars from spacecraft; and various astrophysical problems related to space exploration. A chronicle of scientific events and other notices concerning the main topics of the journal are also presented.
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