Three parameters of the solar cycle: AS, BT and BW.

Details Three parameters of the solar cycle: AS, BT and BW. Three parameters of the solar cycle: AS, BT and BW.

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999acasn..40..142z&link_type=abstract

Acta Astron. Sin., Vol. 40, No. 2, p. 142 - 148

Statistics

Solar Activity Cycles: Statistics

Scientific paper

The long-term evolutionary trend of solar cycles is investigated on the basis of a statistical analysis of the north-south asymmetry of the large sunspot groups in solar cycles Nos. 12 - 22 (1978 - 1995). The numbers of large spot groups in northern and southern hemispheres are denoted by N and S, while the sums of spot groups' latitudes - BN and BS, respectively. Then three parameters are defined with the above four quantities, i.e. (1) the asymmetry index AS = (N-S)/(N+S); (2) the average latitude BT = (BN+BS)/(N+S), where BS is negative; (3) the width of activity belt BW = BN/N-BS/S. Statistical results of the 11 solar cycles are given. From the evolutionary trend of cycles Nos. 12 - 22, it is speculated that the 23rd cycle would possess a southern hemisphere dominance in large sunspot activity.

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