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Study of short-term periodicities in the occurrence of Forbush decreases: wavelet analysis

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Abstract

We utilized the Forbush decreases (magnitude \(>1.5\%\)) detected in cosmic ray neutron monitor data during continuous five solar cycles, viz., 20, 21, 22, 23 and 24 (1965 to 2019) and subjected them to wavelet analysis in order to obtain the possible periodicities in their occurrence. We also studied the periodicities separately during the odd and even solar activity cycles. In addition to solar activity, the solar magnetic polarity and its extension into the interplanetary space makes significant difference in the cosmic ray modulation in the helisphere, we have also applied the wavelet analysis procedure separately during positive (A > 0) and negative (A < 0) polarity states of the heliospheric magnetic fields. Observed periodicities in Forbush decreases have been discussed and compared with earlier detected periodicities in solar and geomagnetic activity indices, e.g., sunspot numbers, sunspot areas, sunspot groups, solar flares, coronal mass ejections, and various geomagnetic activity indices. Significant short-term periodic behaviour detected in the occurrence of Forbush decreases, which in general, corroborates the observed behaviour in solar (in particular, solar eruptive activity) and geomagnetic activity. Understanding the quasi-periodic process in magnetic field emergence from solar active regions and solar eruptive activity, as well as solar-terrestrial coupling and space weather effects, requires comparing the quasi-periodic behaviour between parameters representing solar and geomagnetic activity along with cosmic ray variability.

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Data Availability

No datasets were generated or analysed during the current study.

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Acknowledgements

We gratefully acknowledge the use of catalogue of Forbush decreases and interplanetary disturbances from http://spaceweather.izmiran.ru/eng/dbs.html. We are thankful to the station manager of Moscow neutron monitor station, for the use of Moscow neutron monitor station data. Wavelet software provided by C. Torrence and G. Compo is also acknowledged with thanks.

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  1. Institute of Applied Sciences, Mangalayatan University, Aligarh, 202145, India

    Y. P. Singh

  2. Astronomy Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Badruddin

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The manuscript is focusing on Study of short-term periodicities in the occurrence of Forbush decreases. The manuscript contains one table and eight figures. This manuscript is written by Y. P. Singh and Badruddin and both the authors reviewed the manuscript.

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Singh, Y.P., Badruddin Study of short-term periodicities in the occurrence of Forbush decreases: wavelet analysis. Astrophys Space Sci 369, 66 (2024). https://doi.org/10.1007/s10509-024-04330-6

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