Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9210t&link_type=abstract
American Astronomical Society Meeting 210, #92.10; Bulletin of the American Astronomical Society, Vol. 39, p.210
Astronomy and Astrophysics
Astronomy
Scientific paper
The condition of the solar atmosphere during minimal activity was thoroughly analysed on the basis of the data concerning the allocation of polarity of a large-scale magnetic field in H-alpha line along with the polar and low-latitude activity in line CaII-K. The properties of indices characterizing the minimal activity epoch were also studied. Such indices include douplet-octopole index, netral linelength index, angle of filaments slope, polar activity in line CaII-K in more than 70 degrees latitudes etc. Correlation links were found between these indices and the amplitude of the sunspots’ next cycle. One also scrutinized the duration of the activity cycles. It is shown that an activity cycle cam be counted out from the moment of large-scale magnetic field’s polarity reversal in high latitudes. A connection was established between the length of the cycles and its amplitude. A prognosis of the 24th activity cycle, which made up 120±13W, was carried out.
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