Author(s): Raj Kumar, Asha and Mahesh Chandra Mathpal

Abstract: We present here a study of quasi-periodicity in CME occurrence rate and CME mass rate during solar cycles 23-4 from January 1996 to December 2019. We have utilized Lomb-Scargle (L-S) periodogram method to determine the periodicity. We have used data from the Coordinated Data Analysis Workshops (CDAW) catalog on board SOHO. Our analysis revealed that most detected periods fall within the category of very long-term periodicities. The longest identified period, 10.76 years, aligns with the duration of the solar cycle, while the 5.42-year period represents approximately half of a full cycle. Notably, many of these long-term periods emerged from the investigation of halo CME periodicity. Annual-scale periods of 349, 368, and 431 days were observed exclusively in the total CME occurrence rate during solar cycle 23. Rieger-type periodicities were detected only in the total CME occurrences across both solar cycles 23 and 24. Quasi-biennial periods were also found, but solely in relation to total CME occurrences and CME mass rates. Additionally, short-term periods of 45 and 60 days were identified in the total CME occurrence rate during cycle 23, and in the halo CME mass rate when analyzing both cycles 23 and 24 together.

DOI: 10.22271/maths.2025.v10.i5b.2047

Pages: 137-142 | Views: 912 | Downloads: 8

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