Abstract
The article presents the results of the analysis of the geometric characteristics of sunspots for the period of 15 – 24 Cycles of activity according to the data of Kislovodsk (1956 – 2021) and Royal Greenwich (1918 – 1972) Observatories. To study the shape of sunspots, we used the method of obtaining the average density of the distribution, as well as the average values of the ratio of the extent of the sunspots in latitude and longitude. The deviation of the shape of sunspots from the axisymmetric configuration is investigated. It was found that the sunspots, as a rule, have an ellipsoidal shape and that the major axis of the ellipse, as a rule, is elongated along longitude and has a predominant slope to the equator, different in the northern and southern hemispheres.
The relationship between the shape of sunspots in the current cycle and the amplitude of the next cycle of activity is found. The greater the elongation of the sunspots along the longitude in the current cycle, the more powerful the next cycle of activity will be.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
References
Bray, R.J., Loughhead, R.E.: 1962, Aust. J. Phys. 15, 482. DOI.
Carrington, R.: 1863, Observations of the spots on the Sun from November 9, 1853 to March 24, 1861, Made at Redhill. Williams and Norgate, London.
Collados, M., del Toro Iniesta, J.C., Vazquez, M.A.: 1987, Solar Phys. 112, 281. DOI.
Deng, L.H., Xiang, Y.Y., Qu, Z.N., An, J.M.: 2016, Astrophys. J. 151, 70. DOI.
Gnevyshev, M.N.: 1938, In: Izvestiya Glavnoj Astronomicheskoj Observatorii v Pulkove 16, 36.
Hale, G.E., Ellerman, F., Nicholson, S.B., Joy, A.H.: 1919, Astrophys. J. 49, 153. DOI.
Illarionov, E.A., Tlatov, A.G.: 2016, Geomagn. Aeron. 56, 1031. DOI.
Obashev, S.O., Gainullina, R.K., Minasiants, T.M., Minasiants, G.S.: 1982, Solar Phys. 78, 59. DOI.
Petrovay, K.: 2020, Living Rev. Solar Phys. 17, 2. DOI.
Tlatov, A.G., Pevtsov, A.A.: 2014, Solar Phys. 289, 1143. DOI.
Tlatov, A.G., Skorbehz, N.N., Ershov, V.N.: 2016, ASP Conf. Ser. 504, 237.
Tlatov, A.G., Vasil’eva, V.V., Makarova, V.V., Otkidychev, P.A.: 2014, Solar Phys. 289, 1403. DOI.
Usoskin, I., Kovaltsov, G., Kiviaho, W.R.: 2021, Solar Phys. 296, 13. DOI.
Wilson, P.R.: 1965, Astrophys. J. 142, 773. DOI.
Zhang, L., Mursula, K., Usoskin, I.: 2015, Astron. Astrophys. 575, L2. DOI.
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The author A. Tlatov independently set a goal to analyze the data, prepared computer programs of the program and performed data analysis.
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Tlatov, A.G. The Shape of Sunspots and Solar Activity Cycles. Sol Phys 297, 110 (2022). https://doi.org/10.1007/s11207-022-02045-x
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DOI: https://doi.org/10.1007/s11207-022-02045-x