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Cited by 10 publications
(3 citation statements)
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“…Krivova & Solanki (2002) found a 7.89 yr periodicity by analysing the GWS originated from the RGO monthly sunspot areas data during 1874-1976, and also a 7.97 yr period by analysing the monthly values of the Zürich relative sunspot numbers during 1749-2001. In addition, Zhu & Jia (2018) found a peak of 7.990 yr in the LSP associated to the daily New International Sunspot Numbers during 1818-2014. Moreover, Chowdhury et al (2019) examined the monthly sunspot number taken at Kanzelhöhe Observatory during 1944-2017.…”
Section: Discussionmentioning
confidence: 95%
See 1 more Smart Citation
“…Krivova & Solanki (2002) found a 7.89 yr periodicity by analysing the GWS originated from the RGO monthly sunspot areas data during 1874-1976, and also a 7.97 yr period by analysing the monthly values of the Zürich relative sunspot numbers during 1749-2001. In addition, Zhu & Jia (2018) found a peak of 7.990 yr in the LSP associated to the daily New International Sunspot Numbers during 1818-2014. Moreover, Chowdhury et al (2019) examined the monthly sunspot number taken at Kanzelhöhe Observatory during 1944-2017.…”
Section: Discussionmentioning
confidence: 95%
“…For its part, the Lomb-Scargle periodogram (Lomb, 1976;Scargle, 1982) is a powerful tool commonly used in astrophysics to search for periodic patterns in an unevenly-sampled time series (see VanderPlas (2018) for the Python implementation used in this Section). The LSP has already been used to investigate periodicities in the sunspot areas/numbers (Ballester et al, 2005;Lomb, 2013;Chowdhury et al, 2013;Chowdhury et al, 2015;Lopes & Silva, 2015;Zhu & Jia, 2018) and also in the solar plage areas (Chowdhury et al, 2016). Actually, in this work, each obtained dataset of monthly sum of areas and occurrences of sunspots or solar plages is an uneven-time series due to the days without observations.…”
Section: Power Spectrum Analysismentioning
confidence: 99%
“…For example, the hemispheric asymmetry of solar activity usually shows ∼8-9-year periodic variations (Ballester et al, 2005;De Paula et al, 2022;Deng et al, 2016). Besides, a weak ∼8-year period also appears in the modern sunspot data sets Zhu & Jia, 2018) and the solar 10.7 cm radio flux (Roy et al, 2019). Taking advantage of the highly hemispheric asymmetric of sunspot activity with almost all sunspots confined to the southern hemisphere during the Maunder Minimum (Ribes & Nesme-Ribes, 1993), the ∼8-9-year cycle in the hemispheric asymmetry of solar activity gives clues to understand the solar dynamo during the Maunder Minimum.…”
Section: Discussionmentioning
confidence: 99%