Activity Complexes on the Sun during the 23rd Solar Cycle

作者：Yazev S A^*

来源：Geomagnetism and Aeronomy, 2011, 51(7): 879-887.

DOI：10.1134/S0016793211070267

Results of the study of activity complexes of (AC) on the Sun that evolved during the 23rd solar cycle (SC) are presented. Based on ananalysis of synoptic charts of sunspot activity, 69 AC cores have been detected in the Northern Hemisphere, and 77 AC cores, in the Southern Hemisphere during the 23rd SC. An AC core catalogue has been composed. We have found an increase in the number of AC cores with lifetime (maximum 14 rotations); their nonuniform longitudinal distribution; and a local drop in the number of AC cores during the 23rd SC maximum (1967th-1979th rotations, October 2000-August 2001). The quasiperiodic character of variations in the total rotation-to-rotation power of AC cores during the cycle has been ascertained; the quasi-has 12-14 rotations. A feature of the 23rd SC is a prolonged period of AC generation in comparison with the 22nd SC. Last AC cores in the Southern Hemisphere were observed until the 144th rotation after the previous minimum according to the Wolf numbers (to the 110th rotation in the 22nd SC). The total number of AC cores in the 23rd SC (146) far exceeds that in the 22nd SC (104). Ninety-four percent of high-power proton flares with an energy higher than 10 MeV and a flux of more than 10/(s sm(2) sr) at the Earth's orbit occurred near the AC cores. The total number of proton flares related to AC cores of the above class increased: 48 in the 22nd SC versus 62 in the 23rd SC. We have also revealed a strong north-south asymmetry in the AC evolution manifesting itself in different indices describing AC on the Sun.

• 出版日期2011-12