North–South Distribution of Solar Flares during Cycle 23

Journal of astrophysics and astronomy

P. K. Manoharan¹  P. Pant²  Bhuwan Joshi1² 

[1] Radio Astronomy Centre, Tata Institute of Fundamental Research, Ooty 643 001, India.$$;Aryabhatta Research Institute of Observational Sciences, Nainital 263 129, India.$$

关键词: Sun: activity;    flares;    north–south asymmetry.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

In this paper, we investigate the spatial distribution of solar flares in the northern and southern hemispheres of the Sun that occurred during the period 1996 to 2003. This period of investigation includes the ascending phase, the maximum and part of the descending phase of solar cycle 23. It is revealed that the flare activity during this cycle is low compared to the previous solar cycle, indicating the violation of Gnevyshev–Ohl rule. The distribution of flares with respect to heliographic latitudes shows a significant asymmetry between northern and southern hemisphere which is maximum during the minimum phase of the solar cycle. The present study indicates that the activity dominates the northern hemisphere in general during the rising phase of the cycle (1997–2000). The dominance of northern hemisphere shifted towards the southern hemisphere after the solar maximum in 2000 and remained there in the successive years. Although the annual variations in the asymmetry time series during cycle 23 are quite different from cycle 22, they are comparable to cycle 21.

【 授权许可】

Unknown