Solar rotational period of cosmic rays and solar activity during the maximum phase of solar cycle 24. (6th December 2021)

• Record Type: Journal Article
• Authors: Singh, P R; Farid, A I Saad; Singh, Y P; Singh, A K; Aly, Ayman A
• Is Part Of: Physica scripta. Volume 96:Number 12(2021)
• Publication Date: 2021-12-06
• Subjects: solar rotational period -- sunspot number -- modified coronal index -- flare index -- cosmic ray intensity; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ac3c5b
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: To study the solar rotational oscillation on daily averaged time series of solar activity proxies: sunspot number (SSN), modified coronal index (MCI), solar flare index (FI), and cosmic ray intensity (CRI) are subjected to Lomb/Scargle periodogram, and continuous wavelet transform. For this purpose, we have used data of all the considered parameters from 2012 to 2015, which covers the maximum phase including the polarity reversal period of the solar cycle 24. Both spectral analysis techniques are carried out to study the behavior of 27-days on the time scale of the synodic period and to follow their evolution throughout the epoch. Further, we have used R package RobPer (least square regression) techniques and obtained a significant true period ∼27 days is present in this study. It is noted that the ∼27-day period of solar activity parameters and cosmic rays is much prominent during the examined period.