North-south distribution of solar flares during cycle 23 |
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Authors: | Bhuwan Joshi P Pant P K Manoharan |
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Institution: | (1) Aryabhatta Research Institute of Observational Sciences, Nainital, 263 129, India;(2) Radio Astronomy Centre, Tata Institute of Fundamental Research, Ooty, 643 001, India |
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Abstract: | 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. |
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Keywords: | Sun: activity flares north south asymmetry |
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