A Century of Polar Faculae Variations

Details A Century of Polar Faculae Variations A Century of Polar Faculae Variations

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp23a..04s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP23A-04

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy

Scientific paper

The numbers of faculae at the poles of the Sun have been estimated from white-light images obtained at the Mount Wilson Observatory during 1985-2006 and combined with prior estimates extending back to 1906 when the observations began. The combined data show an 11-yr cyclic variation with faculae maxima occurring during sunspot minima in each of the past 10 sunspot cycles. Also, these numbers of polar faculae are well correlated with the line-of-sight component of the polar magnetic field measured at the Wilcox Solar Observatory since 1976. The numbers of polar faculae show a secular decrease since 1986, suggesting that the polar fields are now weaker than they have been during any cycle in the past century.

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