Abstract
The manuscript deals with the study related to the last four solar cycles 21–24 along with the starting phase of solar cycle 25 based on online available astronomical data. Data related to solar cycles 21–24 (1976–2020) have been analyzed. And we could infer how the solar activities are affected with average sunspot counts. The results based on 27-day-averaged data of three parameters—10.7 cm solar flux, sunspot number, and solar wind proton density—are reported to observe their dependence on each other and how they varied during the starting phase of solar cycle 25. The data for the daily total sunspot number for the 1st day of 2020 to 223rd day of 2020 have also been analyzed and reported. On the basis of our analysis, we observe that the variation in number of sunspots leads to the quasi-periodicity and the difference in the strength of the solar cycle.
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Acknowledgements
We acknowledge the different astronomical observatories for providing free online data to carry out this work. The first author acknowledges the help and support provided for this study during the summer research program at K. S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism. The first author also wants to thank the Physics department of Ewing Christian College for completion of this work.
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Srivastava, S., Chirra, S.K., Pathak, A.K. (2022). A Study of the Solar Cycle 21–24 and the Starting Phase of Solar Cycle 25. In: Pandey, K.L., Priya, P.K., Yadav, U.K., Khandai, P.K. (eds) Proceedings of the National Workshop on Recent Advances in Condensed Matter and High Energy Physics. Springer Proceedings in Physics, vol 278. Springer, Singapore. https://doi.org/10.1007/978-981-19-2592-4_5
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DOI: https://doi.org/10.1007/978-981-19-2592-4_5
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