Changes of Sun magnetic asymmetry
1Leiko, UM 1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine |
Kinemat. fiz. nebesnyh tel (Online) 2016, 32(6):56-67 |
Start Page: Solar Physics |
Language: Russian |
Abstract: We report the results of the analysis of the north-south asymmetry of solar activity, solar magnetic fields. The analysis is based on solar mean magnetic field and solar polar magnetic field time series, 1975—2015 (http://wso.stanford.edu), the Greenwich sunspot data, 1875—2015 (http:// solarscience.msfc.nasa.gov/greenwch.shtml). The long-term cycle (~ 140 years) of north-south asymmetry of solar activity was selected on the time series of the sunspot area. Probably the photospreric large-scale magnetic fields have this long-term cycle also. Variations of the asymmetry of large- scale and small-scale magnetic fields (area of sunspots) are in sync until 2005.5, after this time the dynamics asymmetry passes in antiphase. |
Keywords: magnetic field, north-south asymmetry, solar cycle, Sun |
1.U. M. Leiko, “On some features of the north-south asymmetry of solar activity,” Visn. KNU T. Shevchenka, Ser. Astron. 47, 23–26 (2001).
2.U. M. Leiko, “Features of the asymmetry of solar activity during various time intervals,” Izv. Krym. Astrofiz. Obs. 109, 67–70 (2013).
3.A. V. Mordvinov, “Long-term variations in the asymmetry of the magnetic field of the Sun and heliosphere,” Astron. Rep. 50, 936–943 (2006).
https://doi.org/10.1134/S1063772906110072
4.E. Antonucci, J. T. Hoeksema, and P. H. Scherrer, “Rotation of the photospheric magnetic fields — A northsouth asymmetry,” Astrophys. J. 360, 296–304 (1990).
https://doi.org/10.1086/169120
5.H. D. Babcock, “The Sun’s polar magnetic field,” Astrophys. J. 130, 364–366 (1959).
https://doi.org/10.1086/146726
6.H. W. Babcock, “The topology of the Sun’s magnetic field and the 22-year cycle,” Astrophys. J. 133, 572–587 (1961).
https://doi.org/10.1086/147060
7.J. L. Ballester, R. Oliver, and M. Carbonell, “The periodic behaviour of the North-South asymmetry of sunspot areas revisited,” Astron. Astrophys. 431, L5–L8 (2005).
https://doi.org/10.1051/0004-6361:200400135
8.M. Carbonell, R. Oliver, and J. L. Ballester, “On the asymmetry of solar activity,” Astron. Astrophys. 274, 497–504 (1993).
9.M. Carbonell, J. Terradas, R. Oliver, and J. L. Ballester, “The statistical significance of the North-South asymmetry of solar activity revisited,” Astron. Astrophys. 476, 951–957 (2007).
https://doi.org/10.1051/0004-6361:20078004
10.R. Donner and M. Thiel, “Scale-resolved phase coherence analysis of hemispheric sunspot activity: a new look at the north-south asymmetry,” Astron. Astrophys. 475, L33–L36 (2007).
https://doi.org/10.1051/0004-6361:20078672
11.G. E. Hale, “On the probable existence of a magnetic field in sun-spots,” Astrophys. J. 28, 315–343 (1908).
https://doi.org/10.1086/141602
12.G. E. Hale, F. Ellerman, S. B. Nicholson, and A. H. Joy, “The magnetic polarity of sunspots,” Astrophys. J. 49, 153–178 (1919).
https://doi.org/10.1086/142452
13.D. H. Hathaway, “The solar cycle,” Living Rev. Sol. Phys. 12, 4 (2015). http://solarscience.msfc.nasa.gov/.
https://arxiv.org/abs/1502.07020v1.
https://doi.org/10.1007/lrsp-2015-4
14.H. W. Newton and A. S. Milson, “Note on the observed differences in spottedness of the Sun’s northern and southern hemispheres,” Mon. Not. R. Astron. Soc. 115, 398–404 (1955).
https://doi.org/10.1093/mnras/115.4.398
15.A. Ozguc, T. Atac, and J. Rybak, “Temporal variability of the flare index (1966–2001),” Sol. Phys. 214, 145–155 (2003).
https://doi.org/10.1023/A:1024225802080
16.L. Zhang, K. Mursula, and I. Usoskin, “Solar surface rotation: N-S asymmetry and recent speed-up,” Astron. Astrophys. 575, L2 (2015).
https://doi.org/10.1051/0004-6361/201425169