The implications of the superposed effect of cosmic ray diurnal anisotropy on weak Forbush Events at Apatity and Moscow Neutron Monitors

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-09-05 DOI:10.1007/s10509-024-04358-8
F. M. Menteso, A. E. Chukwude, O. Okike, J. A. Alhassan
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Abstract

Low-magnitude (FD(%) \(\geq -3\%\)) Forbush decreases (FDs) and their space weather linkages are recently becoming popular in the literature. Accurate timing and correct magnitude measurement of weak FDs are a desideratum. This demands disentangling the effects of the ever present cosmic ray (CR) diurnal wave that exerts undesirable influence on CR data. An enhanced version of a recently developed algorithm has been deployed to decompose raw CR data at Apatity (APTY) and Moscow (MOSC) neutron monitor (NM) stations into low and high frequency signals. A subroutine in the Fast Fourier transform software simultaneously calculates the magnitude and the epoch time of the events from the transformed data. The software selected 335 and 359 low magnitude FDs respectively for APTY and MOSC observatories. The large catalogues of low-amplitude FDs selected compared to those in literature may be attributed to the efficiency of the present algorithm. We carried out a regression analysis on the magnitude of these events and the corresponding solar wind disturbance agents. The analysis shows that for the APTY NM station, the correlation coefficient results \(r\) for FD-interplanetary magnetic field (IMF) and FD-planetary geomagnetic activity index (ap) relations are statistically significant at 95% confidence level. At the MOSC station, we find \(r\) ∼ −0.41 statistically significant at 95% confidence level for FD-solar wind speed (SWS) relation (after removing events due to co-rotating interaction regions). Analyzing all (low- and high-amplitude) FDs, \(r\) is relatively strong and statistically significant at 95% confidence level. The implications of these findings are discussed.

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宇宙射线日各向异性的叠加效应对阿帕蒂蒂和莫斯科中子监测站的弱福尔布什事件的影响
低幅度 (FD(%) \(\geq -3\%\))福布什下降(FDs)及其与空间天气的联系最近在文献中变得很流行。对弱 FDs 进行准确的时间和正确的量级测量是当务之急。这就要求剔除宇宙射线(CR)昼夜波的影响,因为昼夜波会对 CR 数据产生不良影响。阿帕蒂(APTY)和莫斯科(MOSC)中子监测站的原始 CR 数据被分解成低频和高频信号。快速傅里叶变换软件中的一个子程序同时计算出变换数据中事件的幅度和纪元时间。该软件为 APTY 和 MOSC 观测站分别选择了 335 和 359 个低振幅 FD。与文献相比,我们选择了大量的低振幅 FD,这可能要归功于本算法的效率。我们对这些事件的幅度和相应的太阳风扰动因子进行了回归分析。分析表明,在APTY NM台站,FD-行星际磁场(IMF)和FD-行星际地磁活动指数(ap)关系的相关系数结果(r/)在95%的置信水平上具有统计学意义。在 MOSC 站,我们发现 FD-太阳风速(SWS)关系的 \(r\) ∼ -0.41 在 95%的置信水平上具有统计意义(在剔除共转相互作用区引起的事件之后)。分析所有(低振幅和高振幅)FD,\(r\)相对较强,在95%置信水平上统计显著。讨论了这些发现的意义。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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