CAOSP abstracts, Volume: 25, year: 1995
- Author(s): STORINI, M.; SYKORA, J.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 25, p. 90-108.
- Date: 09/1995
- Title: Even-odd solar-cycle differences of corona brightness
- Keyword(s): SOLAR CORONA, SOLAR CYCLE, VARIABILITY AND PERIODICITY
- Pages: 90 -- 108
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.
Full text version of this article in
PDF.
