Gnevyshev Peaks in the CME Average Speeds in Cycle 23

Abstract

Sunspots have a major 11-year cycle, but the three to four years near the maximum may show two or more peaks called Gnevyshev peaks. Earlier, it was reported that in Solar Cycle 23, the double peak in sunspot numbers was reflected in the electromagnetic radiations and coronal mass ejection (CME) frequencies in the solar atmosphere, but with phase differences. In this article, it is shown that the average CME speeds also show Gnevyshev peaks but with phase differences.