CAOSP abstracts, Volume: 25, year: 1995

Abstract: Distribution of the green emission corona FeXIV 530.3 nm in the period from 1943 to 1993 is analysed. If the variability of its brightness inside heliographic latitudinal belts is considered, a nearly 22-year periodicity, supporting systematic even-odd solar-cycle differences, emerges. In addition, it seems that a prevailing source of this long-term feature is the alternating behaviour of the minimum values of the 530.3 nm spectral line intensities measured in the middle-latitudinal belt (+/- 20-40 deg.), similar to that one observed in the sunspot-number cycles on a semi-annual basis. The peak value in each odd cycle is higher than that attained in the previous even cycle (the well-known Gnevyshev/Ohl rule). Moreover, activity in the southern hemisphere is more involved in this long-term trend than that in the northern one.

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