Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988baicz..39..243a&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 39, July 1988, p. 243-250.
Astronomy and Astrophysics
Astronomy
6
Long Term Effects, Solar Cycles, Sunspots, Asymmetry, Solar Corona, Solar Oscillations, Solar Rotation, Spatial Distribution, Statistical Analysis
Scientific paper
The existence of quasi-biennial oscillations and time variations of its main characteristics in sunspot activity are analyzed. Five time series of Carrington rotation mean areas for the north and south hemispheres, for the whole solar disk and for the mean heliographic latitudes of spotted areas north and south of the equator are used for the period Carrington rotation 275 to 1649. A distinct north-south asymmetry is observed with larger characteristic periods of the oscillation for the south hemisphere as compared to the north both in the areas and latitudes. There are also long-term variations of the instantaneous period. The north-south asymmetry in the oscillation amplitude manifests itself in a characteristic manner, independent of the established asymmetry for the sunspot cycles.
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