Polar Faculae and Sunspot Cycles

Details Polar Faculae and Sunspot Cycles Polar Faculae and Sunspot Cycles

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..163..267m&link_type=abstract

Solar Physics, Volume 163, Issue 2, pp.267-289

Physics

78

Scientific paper

The monthly number of polar faculae of the Sun were determined from white-light images at spectral band λ(eff) = (4100 ± 200) Å obtained at the Kislovodsk Solar Station during 1960 1994. Corrected monthly numbers were obtained with the help of the visibility function. The level of polar activity larger than 1σ above the monthly running mean was calculated, and the relation between the polar faculae and sunspot cycle was studied. We confirmed earlier results (Makarov and Makarova, 1987) that the monthly number of polar faculae, NPF m (t) correlates with the monthly sunspot area A m (Sp)(t + T) with a time shift T ≈ 6 yr. The new polar faculae cycle began in the middle of 1991. Peculiarities of the first part of sunspot cycle 23 are discussed.

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