Abstract
The short-term periodicity in the solar mean magnetic field (SMMF) observed at the Wilcox Solar Observatory during the last four activity cycles is investigated by using Lomb–Scargle periodograms. Our results show that the SMMF has main periods of about 27, 13.5, and 9 days in both the maximum and minimum years of each activity cycle. The SMMF has the most dominant period of about 27 days during the activity maxima. However, during the activity minimum years the 13.5-day periodicity is the most significant, except for the minimum of 1984 – 1986. These results indicate that the distribution of active regions in the activity maximum years is quite different from that in the minimum years.
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Acknowledgements
This work was supported in part by NSFC (No. 11175147) and by the Fundamental Research Funds for the Central Universities (No. SWJTU11CX076 and No. SWJTU11BR086).
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Ye, N., Zhu, F.R., Zhou, X.M. et al. Short-Term Periodicity in Solar Mean Magnetic Field during Activity Maximum and Minimum Periods. Sol Phys 279, 411–418 (2012). https://doi.org/10.1007/s11207-012-0032-7
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DOI: https://doi.org/10.1007/s11207-012-0032-7