Abstract
H-alpha flares accompanied by the X-radiation f ≥ 10−6 wm−2 in power are examined; 2331 flares were registered during the first half of the 23rd solar cycle (1997–2000). The specific power of the X-radiation of the flares monotonically doubles from the minimum to the maximum of the sunspot. An increase in the number of flares in each solar rotation is nonmonotonic and disproportional to the relative number of sunspots. Several longitudinal intervals with increased flare activity can be distinguished in the entire time interval of five to ten rotations. The longitudinal distributions of flares and boundaries of the sector structures of a large-scale magnetic field differ considerably. This confirms the existence of two types of zero lines; the first type is determined by active regions, and the second one is determined by large-scale structures with weak magnetic fields. The flares concentrate near Hale’s zero lines of the first type.
References
Banin, V.G., Yazev, S.A., and Khmyrov, G.M., “Solnechnye Dannye”, 1991, no. 3, p. 116.
Banin, V.G. and Yazev, S.A., “Solnechnye Dannye”, 1991, no. 2, p. 78.
Eselevich, V.G., Fainshtein, V.G., and Rudenko, G.V., Solar Phys., 1999, vol. 188, p. 277.
Eselevich, V.G. and Eselevich, M.V., Solar Phys., 2002, vol. 208, p. 5.
Fainshtein, V.G., Stepanian, N.N., Akhtemov, Z.S., Rudenko, G.V., and Silakova, E.V., Bull. Crimean Astrophys. Obs., 2011, vol. 107, p. 51.
Malashchuk, V.M., Rudenko, G.V., Stepanian, and N.N., Fainshtein, V.G., Bull. Crimean Astrophys. Obs., 2011, vol. 107, p. 60.
Perebeynos, V.A., Stepanian, N.N., Fainshtein, V.G., and Rudenko, G.V., Bull. Crimean Astrophys. Observ., 2011, vol. 107, p. 51.
Plyusnina, L.A., Solar Phys., 2010, vol. 261, p. 223.
Rudenko, G.V., Solar Phys., 2001, vol. 198, p. 5.
Vitinskii, Yu.I., in Solnechnaya Aktivnost’ (Solar Activity), Moscow: Nauka, 1983, p. 192.
Wilcox, J.M. and Hundhausen, A.J., J. Geophys. Res., 1983, vol. 88, p. 8095.
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Original Russian Text © Z.S. Akhtemov, V.G. Fainshtein, N.N. Stepanian, G.V. Rudenko, 2012, published in Izvestiya Krymskoi Astrofizicheskoi Observatorii, 2012, Vol. 108, pp. 13–25.
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Akhtemov, Z.S., Fainshtein, V.G., Stepanian, N.N. et al. Spatial distribution of solar flares in 23rd solar cycle. Bull.Crim. Astrophys. Observ. 108, 4–12 (2012). https://doi.org/10.3103/S0190271712010020
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DOI: https://doi.org/10.3103/S0190271712010020