Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jbaa..109..210v&link_type=abstract
Journal of the British Astronomical Association, vol.109, no.4, p.210-214
Astronomy and Astrophysics
Astronomy
Scientific paper
Sunspot activity between 1987 and 1996 is analysed using the Zurich classification of sunspots in order to check whether its quality changed during Cycle 22. The mean monthly intensity of the activity is also estimated from the types of sunspots and compared to the international sunspot index Ri. The results indicate no trend in the relative abundance of sunspots of types A, B, C, D and a combination of H and J, while there is a definite decrease in spots of types E, F and G. The high correlation between the monthly solar activity estimated from the types of sunspots, Q, and the international sunspot index Ri observed in the previous cycle is again confirmed. Finally, it is shown that the quality of sunspot activity of Cycle 22 is different from that of the previous cycle.
Tanti A.
Ventura Frank
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