Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995coska..25...90s&link_type=abstract
Consiglio Nazionale delle Ricerche, Contributions of the Astronomical Observatory Skalnate Pleso, Volume 25, p. 90-108
Astronomy and Astrophysics
Astronomy
10
Solar Cycles, Solar Corona, Line Spectra, Sunspot Cycle, Periodic Variations, Southern Hemisphere, Sunspots, Brightness Distribution, Variability, Northern Hemisphere, Luminous Intensity, Interplanetary Medium
Scientific paper
Distribution of the green emission corona Fe XIV 530.3 nm in the period from 1943 to 1993 is analyzed. 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 behavior 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.
Storini Marisa
Sykora Jan
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