Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..88....5r&link_type=abstract
Astrophysics and Space Science, vol. 88, no. 1, Nov. 1982, p. 5-13.
Astronomy and Astrophysics
Astrophysics
3
Solar Activity Effects, Solar Cycles, Solar Rotation, Sunspots, Data Processing, Latitude, Northern Hemisphere, Periodic Variations, Sidereal Time, Spectroheliographs
Scientific paper
The differential rotation of the sun is generally expressed with the aid of a formula in which the sidereal rotational rate xi is provided as a function of the heliographic latitude phi. In the present investigation xi(phi) is found with the aid of this formula on the basis of data from the Greenwich Photoheliographic Results during the 18th solar cycle (1945-1954). Three sets of data were chosen, including set A, set B, and set C. From the 374 sunspots of sets A and B, 204 were recurrent and 170 nonrecurrent, 200 were in the northern hemisphere of the sun, and 174 were in the south. From the 189 groups of set C, 96 were in the northern hemisphere of the sun, and 93 were in the south. On the basis of the obtained results, it is concluded that the differential solar rotation depends on the data used. It appears that there is a variation of the order of 3% with the solar activity.
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