The hemispheric sign rule of current helicity during the rising phase of cycle 23 |
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| Authors: | S D Bao G X Ai H Q Zhang |
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| Institution: | (1) Beijing Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, 100 012 Beijing, China |
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| Abstract: | We compute the signs of two different current helicity parameters (i.e., αbest andH
c) for 87 active regions during the rise of cycle 23 The results indicate that 59% of the active regions in the northern hemisphere
have negative αbest and 65% in the southern hemisphere have positive. This is consistent with that of the cycle 22. However, the helicity parameterH
cshows a weaker opposite hemispheric preference in the new solar cycle. Possible reasons are discussed. |
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| Keywords: | Sun: activity magnetic fields photosphere |
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