The peculiarities of rotation of the solar polar regions
β Scribed by Yu. A. Solonsky; V. V. Makarova
- Book ID
- 104648524
- Publisher
- Springer
- Year
- 1992
- Tongue
- English
- Weight
- 762 KB
- Volume
- 139
- Category
- Article
- ISSN
- 0038-0938
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β¦ Synopsis
The sidereal rotation rate of the high-latitude solar regions is examined using long-lived photospheric polar faculae. The observations were carried out with the photoheliograph of Kislovodsk Mountain Station of the Pulkovo Observatory from 1982 to 1986. The following facts have been established: (a) There is a differential rotation of the polar faculae close to the maximum of solar activity, while the amount of latitude gradient of solar rotation decreases towards the sunspot minimum; (b) small differences of rotation in the northern and southern hemispheres of the Sun are observed; (c)some deviations of differential rotation curves constructed for each Carrington rotation from the mean curve of differential rotation are revealed. The total amplitude of the maximum positive and negative excesses is about 40-50 m s -1 The positive surplus velocities of solar rotation (the amplitude of which is about 20-25 m s -1 ) move in the form of a wave from heliographic latitudes ~ 40 ~ with a velocity of 1.6 m s 1. The latitude width of this flow is AB ~ 15 ~ This wave of abnormally high velocity starts in the year of minimum solar activity and reaches the pole 11 years later. The picture is symmetrical relative to the equator.
π SIMILAR VOLUMES
Howard and Harvey (1970) analyzed Mt. Wilson Doppler shifts to obtain a daily measure of the Sun's differential rotation. The data were fitted to give an angular velocity of the form oJ = a + b sin 2 B + c sin 4 B (B = heliographic latitude). Changes in a, b, c were found to be correlated (Howard