Computer Science
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991bsold...6...95m&link_type=abstract
Byulletin Solnechnye Dannye Akademie Nauk USSR, No. 6/91, p. 95 - 103
Computer Science
Solar Magnetic Fields: Solar Activity Cycles, Solar Magnetic Fields: Evolution
Scientific paper
The properties of the latitude-time distribution of the area of predominant polarity of a large-scale magnetic field on the Sun have been studied in 10° latitude zones on Hα charts for 1915 - 1985. The power spectrum of the rotating symmetric harmonic, l-mode, when m = 0 has been calculated for the entire period in question and separated for the epoch of maxima and minima of the cycle. It is shown that alongside with the dipole component l = 1, the mode l = 3 (octapole) is dominant at some intervals of the minimum activity. The mode l = 5 is dominant at the maximum of activity. The intensity of even modes is 3 - 5 times smaller than that of odd modes. Two dominant periods are detected: 22 year and 7 year; they have the maximum intensity of the power spectrum at l = 3 and l = 5, respectively. The dependence of the phase φ(l)/2π on l-mode is determined. The phase displacement between the activity of the large-scale magnetic field at the latitude larger 40° and the zone of sunspot activity is derived.
Gokhale M. H.
Makarov Valentin I.
Sivaraman K. R.
Tavastsherna K. S.
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