Solar Physics

, 294:27 | Cite as

Study of the Solar Rotational Period and Its Harmonics in Solar Activity, Interplanetary, Geomagnetic, and Cosmic Ray Intensity Indicators During Solar Polarity Reversal Periods

  • Y. P. SinghEmail author
  • Badruddin


Short-term variations of interplanetary magnetic field, solar wind speed, solar radio flux, geomagnetic ap index and cosmic ray intensity have been studied during the last five polarity reversal periods in the period from Solar Cycles 20 to 24. Hourly data of all the considered parameters are subject to wavelet analysis exclusively during the polarity reversal periods of these five solar cycles. These solar polarity reversal periods lie during or around the solar maximum of the respective solar cycles. Study reveals a few noteworthy results during these disturbed periods. Periodicities such as the synodic period (\({\approx\,}27.0\) days), its second (\({\approx\,}13.5\) days) and third (\({\approx\,}9.1\)-days) harmonics, \({\approx\,}6.8\)-day, \({\approx\,}5.5\)-day and \({\approx\,}4.2\)-day periods are consistently observed during the reversal times with prominent signatures in addition to quasi-periodicities (18.5 days, 16.7 days, 10.6 days, 2.8 days, 2.4 days, and 1.8 days). These significant variations are very strong during reversal periods as they appear in minimum phases of the solar cycles, as reported by Singh and Badruddin (Astrophys. Space Sci.359, 60, 2015a); they could be the higher harmonics (fourth, fifth, and sixth) of the synodic period.


Wavelet analysis Synodic period Harmonics Cosmic rays Geomagnetic activity Solar wind Solar flux 



We gratefully acknowledge the use of Oulu neutron monitor data and those from the Space Science Data Centre ( ). We thank the Station Manager of Oulu NM (Ilya Usoskin) for making the data available. The wavelet software provided by C. Torrence and G. Compo is acknowledged with thanks. The constructive comments by the referee are also acknowledged with thanks.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.IASMangalayatan UniversityAligarhIndia
  2. 2.Astronomy Department, Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia

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