Abstract
In this paper the N—S asymmetry of the soft X-ray flare index (FI SXR) during solar cycles 21, 22 and 23 has been analyzed. The results show the existence of a real N—S asymmetry which is strengthened during solar minimum. The slope of regression lines fitted to the daily values of asymmetry time series is negative in all three cycles. The yearly asymmetry curve can be fitted by a sinusoidal function with a period of eleven years. The power spectral analysis of daily asymmetry time series reveals significant periods of around 28.26 days, 550.73 days and 3.72 years.
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Akioka, M., Kubota, J., Suzuki, M., Ichimoto, K., and Tohmura, I.: 1987, Solar Phys. 112, 313.
Antalová, A.: 1996, Contrib. Astron. Obs. Skalnaté Pleso. 26, 98.
Antonucci, E., Hoeksema, J. T., and Scherrer, P. H.: 1990, Astrophys. J. 360, 296.
Ataç, T. and Özgüç, A.: 1996, Solar Phys. 166, 201.
Ataç, T. and Özgüç, A.: 1998, Solar Phys. 180, 397.
Ataç, T. and Özgüç, A.: 2001, Solar Phys. 198, 399.
Bai, T.: 1987, Astrophys. J. 318, L85.
Bai, T. and Cliver, E. W..: 1990, Astrophys. J. 363, 299.
Bai T. and Sturrock, P. A.: 1991, Nature 352, 360.
Bell, B.: 1962, Smithsonian Contr. Astrophys. 5, 203.
Bouwer, S. D.: 1992, Solar Phys. 142, 365.
Carbonell, M., Oliver, R., and Ballester, J. L.: 1993, Astron. Astrophys. 274, 497.
Horne, J. H. and Baliunas, S. L.: 1986, Astrophys. J. 302, 757.
Ichimoto, K., Kubota, J., Suzuki, M., Tohmura, I., and Kurokawa, H.: 1985, Nature 316, 422.
Joshi, A.: 1995, Solar Phys. 157, 315.
Joshi, A.: 1999, Solar Phys. 185, 397.
Kleczek, J.: 1952, Publ. Contr. Astron. No. 22, Prague.
Kleczek, J.: 1953, Publ. Astrophys. Obs. Czech. Acad. Sci. No. 24, Prague.
Knoška, Š.: 1985, Contrib. Astron. Obs. Skalnaté Pleso 13, 217.
Landi, R., Moreno, G., Storini, M., and Antalová, A.: 1998, J. Geophys. Res. 103, No. A9, 20553.
Letfus, V.: 1960, Bull. Astron. Inst. Czech. 11, 31.
Li, K. J., Schmieder, B., and Li, Q. S.: 1998, Astron. Astrophys. 131, 99.
Li, K. J., Wang, J. X., Xiong, S. Y., Liang, H. F., Yun, H. S., and Gu, X. M.: 2002, Astron. Astrophys. 383, 648.
Lomb, N.: 1976, Astrophys. Space Sci. 39, 477.
Lou, Y., Wang, Y., Fan, Z., Wang, S., and Wang, J.: 2003, Monthly Notices Royal Astron. Soc., in press.
Oliver, R., Carbonell, M., and Ballester, J. L.: 1992, Solar Phys. 137, 141.
Oliver, R., Ballester, J. L.: 1994, Solar Phys. 152, 481.
Özgüç, A. and Ataç, T.: 1989, Solar Phys. 123, 357.
Özgüç, A. and Ataç, T.: 1996, Solar Phys. 163, 183.
Özgüç, A., Ataç, T., and Rybák, J.: 2002, J. Geophys. Res. 107, No. A7, 10.1029/2001JA009080.
Özgüç, A., Ataç, T., and Rybák, J.: 2003, Solar Phys. 214, 375.
Pap, J., Tobiska, W. K., and Bouwer, S. D.: 1990, Solar Phys. 129, 165.
Rao, R.: 1973, Solar Phys. 29, 47.
Roy, J. R.: 1977, Solar Phys. 52, 53.
Scargle. J. D.: 1982, Astrophys. J. 263, 835.
Swinson, D. B., Koyama, H, and Saito, T.: 1986, Solar Phys. 106, 35.
Temmer, M., Veronig, A., Hanslmeier, A., Otruba, W., and Messerotti, M.: 2001, Astron. Astrophys. 375, 1049.
Temmer, M., Veronig, A., and Hanslmeier, A..: 2002, Astron. Astrophys. 390, 707.
Verma, V. K.: 1993, Astrophys. J. 403, 797.
Vizoso, G. and Ballester, J. L.: 1987 Solar Phys. 112, 317.
Vizoso, G. and Ballester, J. L.: 1989 Solar Phys. 119, 411.
Vizoso, G. and Ballester, J. L.: 1990 Astron. Astrophys. 229, 540.
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Joshi, B., Joshi, A. The North—South Asymmetry of Soft X-Ray Flare Index During Solar Cycles 21, 22 and 23. Solar Physics 219, 343–356 (2004). https://doi.org/10.1023/B:SOLA.0000022977.95023.a7
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DOI: https://doi.org/10.1023/B:SOLA.0000022977.95023.a7