Quasi-periodicities in cosmic rays and time lag with the solar activity at a middle latitude neutron monitor: 1982–2017

Preliminary Results from A Mini Neutron Monitor in Central Saudi Arabia

“…These are the 36 days, 23 days, 12.5 days, 7.4 days, 5.6 days, 4.9 days, and 3.5 days. The obtained periodicities are in agreements with those found by several investigators [e.g., [11][12][13].…”

Correlation analysis between the Aerosol Optical Depth and Cosmic Rays

“…It is clearly, evident that the 3.6 years and 1.7 years are common Quasi-periodicities between the CR and AOD time series. These periodicities are similar to those reported by several investigators and found in solar, interplanetary, and cosmic ray parameters [13][14][15][16][17][18]. The results presented in this study are preliminary, more detailed investigations of time series of atmospheric aerosol measurements and CR data at various locations and for longer time periods are recommended.…”

Experimental Investigation of the Delay Time in Galactic Cosmic Ray Flux in Different Epochs of Solar Magnetic Cycles: 1959 – 2014

“…All these processes are vital, but their contribution in the modulation is different and depends on the SA. Many studies of the DT problem showed that the DTs are more pronounced in odd SA cycles (Burlaga, McDonald, and Ness, 1993;Parker, 1963) than in even SA cycles (Dorman, 1959;Jokipii and Thomas, 1981) and interpreted this phenomenon in terms of drift effects (Cliver and Ling, 2001;Chowdhury, Kudela, and Dwivedi, 2013;Chowdhury and Kudela, 2018;Mavromichalaki, Belehaki, and Rafios, 1998).…”

“…Table 3 Correlation coefficients, r, and DTs for 10 sub-periods. In the cycles column, upward and downward arrows represent ascending and descending GCR intensity, respectively (see text and Chowdhury, Kudela, and Dwivedi (2013) and Chowdhury and Kudela (2018) discussed in detail the phenomena of GCR modulation and the DT problem between I (GCR) and various parameters characterizing conditions in the heliosphere. Chowdhury, Kudela, and Dwivedi (2013) mentioned that this is a very complex phenomenon occurring throughout the heliosphere that depends on several factors.…”

“…The author used a cross-correlation analysis to find the maximum negative correlation needed to find DTs. Chowdhury, Kudela, and Dwivedi (2013) and Chowdhury and Kudela (2018) stated that there is no DT between the GCR intensity and the IMF magnitude, nor between the GCR intensity and the Ap index. The above considerations show that DTs are a complex subject that depends on many parameters.…”