Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...78...59o&link_type=abstract
Solar Physics, vol. 78, May 1982, p. 59-66.
Physics
2
Angles (Geometry), Inclination, Sunspots, Coronagraphs, Line Of Sight, Spectroheliographs, Symmetry
Scientific paper
The Wilson effect is used to estimate the sunspot symmetry axis inclination angle to the solar surface, explaining the observed negative Wilson effect. Using photoheliograms taken at the high altitude solar observatory at Alma-Ata, 111 sunspots of regular shape at different heliocentric angles were measured, and all observations within an angular interval of 10 deg were averaged in order to study the dependence of the Wilson effect on the heliocentric angle. The resulting curve is represented by two sinusoids originating from one point with zero point shifted along both axes. The zero shift in the angle points to an inclination of the sunspot symmetry axis to the solar surface to the east of the normal, which accounts for (1) the east-west asymmetry of the Wilson effect; (2) the presence of all three types of the effect; (3) the maximum positive effect occurring on the east part of the disk, while the zero and negative effects occur more frequently on the west part.
Gainullina Kh. R.
Minasiants G. S.
Minasiants T. M.
Obashev S. O.
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