Polar Faculae Are Faculae Of Old Age, Ascending To Photosphere From The Suns Upper Magnetic Toroid Levels

Details Polar Faculae Are Faculae Of Old Age, Ascending To Photosphere From The Suns Upper Magnetic Toroid Levels Polar Faculae Are Faculae Of Old Age, Ascending To Photosphere From The Suns Upper Magnetic Toroid Levels

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppuo1013m&link_type=abstract

American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,

Physics

Plasma Physics

Scientific paper

We present arguments that Sun's polar magnetic fields, near 1 gauss strength, ascend to photosphere in polar facular increment, in accord with Fig. 1, ^1 thru secular meridional circulation of both 3,600 +/- 25 gauss mag. toroids (as obs. at upper level) of each hemisphere, reversing polarities every 11 yr. Having been submerged to just below lower mag. toroid and traveling slightly faster there in circulatory mer. motions of Sun, which drive toroids, incipient polar faculae do not ascend with toroid at θc = 40^o,, but continue to higher latitudes >= 50^o, and now having aged by as much as one solar cycle plus ˜ 3 yr., they begin their appearance at photosphere. Ascent to photosphere requires greater travel time the greater is their lat. of vertical ascent, owing to reduced mer. circulation velocity with inc. in lat. above 40^o, (Confer sketch of fluid motions, Fig. 1. ^1) This polar faculae reaching photosphere at 63^o,, where surface density increases strongly and reaches an almost constant value at θc = 70^o,, and that possibly extends over whole polar cap when near polar facular max., would be expected to have been formed at 40^o, or at lesser lat. as faculae in previous sunspot cycle and would thus possess a significantly reduced observed lifetime compared to faculae in photosphere newly found below 40^o,.

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