Computer Science
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981vekaz.......36o&link_type=abstract
Akademiia Nauk Kazakhskoi SSR, Vestnik, Mar. 1981, p. 36-42. In Russian.
Computer Science
Penumbras, Solar Position, Sunspots, Umbras, Asymmetry, Heliometers, Least Squares Method, Sun
Scientific paper
A possible east-west asymmetry in the variation of the apparent displacement of the sunspot umbra within the penumbra with heliocentric position angle known as the Wilson effect is investigated. Separate observations of the magnitude of the Wilson effect on the eastern and western halves of the solar disk acquired from 1958 to 1979 were compared and analyzed. A marked east-west asymmetry in the direction and magnitude of the effect is observed, with the positive Wilson effect (apparent width of the penumbra greater on the limbward side of the spot) having its greatest magnitude on the east side of the disk, and zero and negative Wilson effects more prevalent on the western half. The variation of the observed Wilson effect with heliocentric angle can be fit by two sine curves originating from a point displaced from the zero points of the solar position angle and the Wilson effect. The location of the origin of the curve is shown to indicate that the axis of symmetry of the sunspot is inclined by an angle of about 34 deg to the east of the normal to the solar surface. Results also indicate a mean sunspot depth of about 818 km.
Gainullina Kh. R.
Minasiants G. S.
Minasiants T. M.
Obashev S. O.
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