Some asymmetry in distribution of Hα flares on the solar disk during the 21th cycle
Heading:
| 1Akimov, LA, 1Belkina, IL 1Research Institute of Astronomy at V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2015, 31(3):54-62 |
| Start Page: Solar Physics |
| Language: Russian |
Abstract: The North-South and East-West asymmetries in the distribution of Нα flare numbers on the solar disk in the 21-th cycle of the solar activity are studied. It is shown that the mean number of flares on the eastern half of the solar disk is, on the average, by 2.7 % more than that of the western one, and a difference between the numbers of northern and southern flares is unimportant. However, at the beginning of the cycle more flares occurred in the northern hemisphere, and at the end of the cycle a southern flare dominance was observed. It is shown that North-South asymmetry has a period of 540 days, and an annual period is pronounced for the East-West asymmetry. One of the possible explanation for East-West asymmetry is planet effects on the solar activity. |
| Keywords: asymmetry of flashes, Sun |
References:
1.M. Val’dmaer, Results and Problems in the Study of the Sun (Inostrannaya Literatura, Moscow, 1950) [in Russian].
2.Yu. I. Vitinskii, M. Kopetskii, and G. V. Kuklin, Statistics of the Spot-Prodicing Activity of the Sun (Nauka, Moscow, 1986) [in Russian].
3.P. R. Romanchuk, “The nature of the solar cyclicality,” Astron. Zh. 58(1), 158–166 (1981).
4.A. A. Shpital’naya, “Examination of flares in the heliocentric galactic coordinate system,” Soln. Dannye, No. 12, 95–106 (1980).
5.T. Bai, “Hot spots for solar lares persisting for decades: longitude distributions of flares of cycles 19–23,” Astrophys. J. 585, 1114–1123 (2003).
https://doi.org/10.1086/346152
6.V. Bumba, “Regularities in the solar background magnetic field,” Izv. Krym. Astrofiz. Obs. 104(6), 87–94 (2009).
7.G. Godoli and G. Poletto, “A possible connection between N-S and E-W solar asymmetries,” Sol. Phys. 10, 494–495 (1969).
https://doi.org/10.1007/BF00145535
8.M. Klvana, M. Svanda, A. Krivtsov, and V. Bumba, “Do tidal waves exist in the solar photosphere?,” Hvar Observ. Bull. 28(1), 157–165 (2004).
9.R. R. Knaack, J. O. Stenflo, and S. V. Berdyugina, “Evolution and rotation of large-scale photospheric magnetic field of the Sun during cycles 21–23,” Astron. Astrophys. 438, 1067–1082 (2005).
https://doi.org/10.1051/0004-6361:20042091
10.A. M. Krivtsov, M. Klvana, and V. Bumba, “Photosphere Velocity Field Generated by Tidal Forces,” in Solar Variability as an Input to the Earth’s Environment (Proc. Int. Solar Cycle Studies Symp. Tatranska Lomnica, Slovak Republic, June 23–28, 2003), Ed. by A. Wilson (ESA, Noordwijk, 2003), pp. 121–123.
11.V. Letfus and B. Ruzickova-Topolova, “Time variation of the E-W asymmetry of flares numers witch respect to the phase of solar cycles,” Bull. Astron. Inst. Czech. 31, 232–239 (1980).
12.A. Ozguc, T. Atac, and J. Rybak, “Long-term Periodicities in the flare index between the years 1966–2001,” in Proc. 10th Eur. Solar Physics Meeting, Prague, Sept. 9–14, 2002 (ESA, Noordwijk, 2002), Vol. 2, pp. 709–712.
13.N. Scafetta, “Does the Sun work as a nuclear fusion amplifier of planetary tidal forsing? A proposal for a physical mechanism based on the mass-luminosity relation,” J. Atmos. Sol.-Terr. Phys., Nos. 81–82, 27–40 (2012).
14.M. Temmer, A. Veronig, A. Hanlmeier, et al., “Statistical analysis of solar Hα flares,” Astron. Astrophys. 375, 1049–1061 (2001).
https://doi.org/10.1051/0004-6361:20010908