Abstract
The double Hale cycle (about 44 years) was found in changes of power-law index for integral distributions of equivalent diameters of large groups of sunspots having sizes of 50–90 Mm. According to the Greenwich catalog data, this cycle is traced in the last 13 cycles of solar activity, nos. 12–24. In addition to this periodic change, a unique sporadic phenomenon was discovered, namely, a sharp jump in the maximum diameters of sunspot groups in the 18th cycle (more precisely, in 1946–1947), which has no analogues in other cycles.
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REFERENCES
Babij, V.P., Efimenko, V.M., and Lozitsky, V.G., Statistical characteristics of large sunspots in solar activity cycles 17–23, Kinematics Phys. Celestial Bodies, 2011, vol. 27, no. 4, pp. 191–196.
Efimenko, V. and Lozitsky, V., Statistical peculiarities of 24th cycle of solar activity, Bull. Kyiv. Nats. Univ., Astron., 2016, no. 53, pp. 52–55.
Gnevyshev, M.N., Essential features of the 11-year solar cycle, Sol. Phys., 1977, vol. 51, pp. 175–183.
Hale, G.E. and Nicholson, S.B., The law of sun-spot polarity, Astrophys. J., 1925, vol. 62, pp. 270–300.
Javaraiah, J., Long-term variations in the solar different rotation, Sol. Phys., 2003, vol. 212, no. 1, pp. 23–49.
Krivova, N.A. and Solanki, S.K., The 1.3-year and 156-day periodicities in sunspot data: Wavelet analysis suggests a common origin, Astron. Astrophys., 2002, vol. 394, pp. 701–706.
Lean, J.L. and Brueckner, G.E., Intermediate-term solar periodicities: 100–500 days, Astrophys. J., 1989, vol. 337, no. 1, pp. 568–578.
Lozitska, N.I., Problem of mistakes in databases, processing and interpretation of observations of the sun, Odessa Astron. Publ., 2015, vol. 28, no. 2, pp. 236–237.
Lozitska, N.I. and Efimenko, V.M., Indexes of groups of sunspots for long-term forecasting of geomagnetic activity, Byull. Kyiv. Natl. Univ., Astron., 2015, no. 52, pp. 43–47.
Mandal, S. and Banerjee, D., Sunspot sizes and the solar cycle: analysis using Kodaikanal white-light digitized data, Astrophys. J. Lett., 2016, vol. 830, no. 2, id L33.
Muñoz-Jaramillo, A., Senkpeil, R.R., Windmueller, J.C., Amouzou, E.C., Longcope, D.W., Tlatov, A.G., Nagovitsyn, Y.A., Pevtsov, A.A., et al., Small-scale and global dynamos and the area and flux distributions of active regions, sunspot groups and sunspots: A multi-database study, Astrophys. J., 2015, vol. 800, no. 1, id 48.
Nagovitsyn, Yu.A. and Pevtsov, A.A., On the presence of two populations of sunspots, Astrophys. J., 2016, vol. 833, no. 1, id 94.
Pevtsov, A.A., Nagovitsyn, Yu.A., Tlatov, A.G., and Rybak, A.L., Long-term trends in sunspot magnetic fields, Astrophys. J. Lett., 2011, vol. 742, no. 2, id L36.
Svalgaard, L., Cliver, E.W., and Kamide, Y., Sunspot cycle 24: Smallest cycle in 100 years?, Geophys. Res. Lett., 2005, vol. 32, no. 1, L01104.
Tsirulnik, L.B., Kuznetsova, T.V., and Oraevsky, V.N., Forecasting the 23rd and 24th solar cycles on the basis of MGM spectrum, Adv. Space Res., 1997, vol. 20, no. 12, pp. 2369–2372.
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This study was funded by the Taras Shevchenko National University of Kyiv, project no. 16БФ023-01.
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Efimenko, V.M., Lozitsky, V.G. New Data about Long-Term Changes of Solar Activity. Geomagn. Aeron. 58, 1057–1060 (2018). https://doi.org/10.1134/S0016793218080066
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DOI: https://doi.org/10.1134/S0016793218080066