Abstract
This paper presents a statistical analysis of soft X-ray flares during the period January 1986 to June 2017 covering the last three solar cycles (SCs) 22, 23, and 24. We have analyzed the distribution of flare number, the relationship between the occurrence rate of soft X-ray flares and solar activity, and the duration of different intensity class (B, C, M, and X) solar flares during the period of investigation. The total occurrence rates of M and X class flares are 10.33%, 6.77%, and 5.45% in SCs 22, 23, and 24, respectively, which indicates that SC 22 is an SC with frequent large flares. Meanwhile, the M and X class flares are mainly concentrated in solar maximum (71.13%) in SC 22. The correlation coefficients between the annual number of flares and solar F10.7 index, X-ray flux in 0.1–0.8 nm, and EUV flux in 0.1–50 nm in SC 24 (0.91, 0.88, and 0.96) are greater than that in SCs 23 (0.87, 0.85, and 0.86) and 22 (0.88 and 0.81). The median values of the duration of M and X class flares are 39.00 and 71.50 minutes in SC 22, 21.00 and 26.50 minutes in SC 23, and 19.00 and 24.00 minutes in SC 24. The duration of M and X class flares in SC 22 is obviously longer than that in SCs 23 and 24. In addition, the duration of flares increases with the increase of flare intensity.
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Abdel-Sattar, W., Mawad, R., Moussas, X.: Study of solar flares’ latitudinal distribution during the solar period 2002–2017: GOES and RHESSI data comparison. Adv. Space Res. 62(9), 2701–2707 (2018)
Ataç, T., Özgüç, A.: Flare index during the rising phase of solar cycle 23. Sol. Phys. 198(2), 399–407 (2001)
Belucz, B., Forgács-Dajka, E., Dikpati, M.: Exploring the North-South asymmetry in a Babcock-Leighton dynamo. Astron. Nachr. 334(9), 960–963 (2013)
Belucz, B., Dikpati, M., Forgács-Dajka, E.: A Babcock–Leighton solar dynamo model with multi-cellular meridional circulation in advection- and diffusion-dominated regimes. Astrophys. J. 806(2), 169 (2015)
Chen, Y., Le, G., Lu, Y., Chen, M., Ding, L., Yin, Z.: The statistical properties of the solar soft X-ray fluence during 1997–2008. Astrophys. Space Sci. 361(1), 40 (2016)
Chowdhury, P., Choudhary, D.P., Gosain, S.: A study of the hemispheric asymmetry of sunspot area during solar cycles 23 and 24. Astrophys. J. 768(2), 188 (2013)
de Toma, G., White, O.R., Chapman, G.A., Walton, S.R., Preminger, D.G., Cookson, A.M.: Solar cycle 23: an anomalous cycle? Astrophys. J. 609(2), 1140 (2004)
Donnelly, R.F.: Empirical models of solar flare X ray and EUV emission for use in studying their E and F region effects. J. Geophys. Res. 81(25), 4745–4753 (1976)
Feldman, U., Doschek, G.A., Klimchuk, J.A.: The occurrence rate of soft X-ray flares as a function of solar activity. Astrophys. J. 474(1), 511–517 (1997)
Garcia, H.A.: Evidence for solar-cycle evolution of North-South flare asymmetry during cycles 20 and 21. Sol. Phys. 127(1), 185–197 (1990)
Joshi, A.: Asymmetries during the maximum phase of solar cycle 22. Sol. Phys. 157(1–2), 315–324 (1995)
Joshi, A., Chandra, R.: North-South distribution and asymmetry of GOES SXR flares during solar cycle 24. Open Astron. 28(1), 228–235 (2019)
Joshi, B., Joshi, A.: The North-South asymmetry of soft X-ray flare index during solar cycles 21, 22 and 23. Sol. Phys. 219(2), 343–356 (2004)
Joshi, B., Pant, P., Manoharan, P.K.: North-South distribution of solar flares during cycle 23. J. Astrophys. Astron. 27(2–3), 151–157 (2006)
Joshi, N.C., Bankoti, N.S., Pande, S., Pande, B., Uddin, W., Pandey, K.: Statistical analysis of soft X-ray solar flares during solar cycles 21, 22 and 23. New Astron. 15(6), 538–546 (2010)
Joshi, B., Bhattacharyya, R., Pandey, K.K., Kushwaha, U., Moon, Y.J.: Evolutionary aspects and North-South asymmetry of soft X-ray flare index during solar cycles 21, 22, and 23. Astron. Astrophys. 582, A4 (2015)
Kossobokov, V., Le Mouël, J.L., Courtillot, V.: On solar flares and cycle 23. Sol. Phys. 276(1–2), 383–394 (2012)
Le, H., Liu, L., He, H., Wan, W.: Statistical analysis of solar EUV and X-ray flux enhancements induced by solar flares and its implication to upper atmosphere. J. Geophys. Res. Space Phys. 116, A11301 (2011). https://doi.org/10.1029/2011JA016704
Lee, K., Moon, Y.J., Lee, J.Y., Lee, K.S., Na, H.: Solar flare occurrence rate and probability in terms of the sunspot classification supplemented with sunspot area and its changes. Sol. Phys. 281(2), 639–650 (2012)
Li, K.J., Schmieder, B., Li, Q.S.: Statistical analysis of the X-ray flares (M≥1) during the maximum period of solar cycle 22. Astron. Astrophys. Suppl. Ser. 131(1), 99–104 (1998)
Lukianova, R., Mursula, K.: Changed relation between sunspot numbers, solar UV/EUV radiation and TSI during the declining phase of solar cycle 23. J. Atmos. Sol.-Terr. Phys. 73(2–3), 235–240 (2011)
McDonald, F.B., Webber, W.R., Reames, D.V.: Unusual time histories of galactic and anomalous cosmic rays at 1 AU over the deep solar minimum of cycle 23/24. Geophys. Res. Lett. 37, L18101 (2010). https://doi.org/10.1029/2010GL044218
Pandey, K.K., Yellaiah, G., Hiremath, K.M.: Latitudinal distribution of soft X-ray flares and dispairty in butterfly diagram. Astrophys. Space Sci. 356(2), 215–224 (2015)
Pearce, G., Rowe, A., Yeung, J.: A statistical analysis of hard X-ray solar flares. Astrophys. Space Sci. 208(1), 99–111 (1993)
Ravindra, B., Javaraiah, J.: Hemispheric asymmetry of sunspot area in solar cycle 23 and rising phase of solar cycle 24: comparison of three data sets. New Astron. 39, 55–63 (2015)
Švestka, Z.: A comparison of solar activity during the decline of several solar cycles. Adv. Space Res. 16(9), 27–36 (1995)
Temmer, M., Veronig, A., Hanslmeier, A., Steinegger, M., Brunner, G., Gonzi, S., Otruba, W., Messerotti, M.: Statistical properties relevant to solar flare prediction. Hvar Obs. Bull. 24, 185–194 (2000)
Temmer, M., Veronig, A., Hanslmeier, A., Otruba, W., Messerotti, M.: Statistical analysis of solar H-alpha flares. Astron. Astrophys. 375, 1049–1061 (2001)
Temmer, M., Rybák, J., Bendik, P., Veronig, A., Vogler, F., Otruba, W., Pötzi, W., Hanslmeier, A.: Hemispheric sunspot numbers Rn and Rs from 1945-2004: catalogue and N-S asymmetry analysis for solar cycles 18–23. Astron. Astrophys. 447(2), 735–743 (2006)
Veronig, A., Temmer, M., Hanslmeier, A., Otruba, W., Messerotti, M.: Temporal aspects and frequency distributions of solar soft X-ray flares. Astron. Astrophys. 382(3), 1070–1080 (2002)
Wang, Y.M., Robbrecht, E., Sheeley, N.R. Jr: On the weakening of the polar magnetic fields during solar cycle 23. Astrophys. J. 707(2), 1372–1386 (2009)
Wilson, R.M.: Statistical Aspects of Solar Flares p. 2714. National Aeronautics and Space Administration, Scientific and Technical Branch (1987)
Xiong, B., Wan, W., Liu, L., Withers, P., Zhao, B., Ning, B., Wei, Y., Le, H., Ren, Z., Chen, Y., He, M.: Ionospheric response to the X-class solar flare on 7 September 2005. J. Geophys. Res. Space Phys. 116, A11317 (2011). https://doi.org/10.1029/2011JA016961
Xiong, B., Wan, W., Ning, B., Ding, F., Hu, L., Yu, Y.: A statistic study of ionospheric solar flare activity indicator. Space Weather 12(1), 29–40 (2014a)
Xiong, B., Wan, W., Ning, B., Hu, L., Ding, F., Zhao, B., Li, J.: Investigation of mid-and low-latitude ionosphere based on BDS, GLONASS and GPS observations. Chin. J. Geophys. 57(11), 3586–3599 (2014b) (in Chinese)
Xiong, B., Wan, W., Zhao, B., Yu, Y., Wei, Y., Ren, Z., Liu, J.: Response of the American equatorial and low-latitude ionosphere to the X1.5 solar flare on 13 September 2005. J. Geophys. Res. Space Phys. 119(12), 10336–10347 (2014c). https://doi.org/10.1002/2014JA020536
Xiong, B., Li, X., Wan, W., She, C., Hu, L., Ding, F., Zhao, B.: A method for estimating GNSS instrumental biases and its application based on a receiver of multisystem. Chin. J. Geophys. 62(4), 1199–1209 (2019) (in Chinese). https://doi.org/10.6038/cjg2019M0318
Zhang, D.H., Mo, X.H., Cai, L., Zhang, W., Feng, M., Hao, Y.Q., Xiao, Z.: Impact factor for the ionospheric total electron content response to solar flare irradiation. J. Geophys. Res. Space Phys. 116, A04311 (2011). https://doi.org/10.1029/2010JA016089
Acknowledgements
This work was supported by the Natural Science Funds of Hebei (Grant No. D2019502010), Fundamental Research Funds for the Central Universities (2018MS128), National Natural Science Foundation of China (41574151, 41574162, and 41404127) and National High Technology Research and Development Program of China (2014AA123503). The F10.7 index, H-alpha solar flare reports, and X-ray flux data are provided by the National Geophysical Data Center. The EUV flux data are from the Solar Extreme Ultraviolet Monitor onboard SOHO. We thank the RHESSI team for providing the flare list (https://hesperia.gsfc.nasa.gov).
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Xiong, B., Wang, T., Li, X. et al. Statistical analysis of soft X-ray solar flares during solar cycles 22, 23, and 24. Astrophys Space Sci 366, 1 (2021). https://doi.org/10.1007/s10509-020-03909-z
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DOI: https://doi.org/10.1007/s10509-020-03909-z