Differential rotation of sunspot groups in the period from 1874 through 1976 and changes of the rotation velocity within the solar cycle

Details Differential rotation of sunspot groups in the period from 1874 through 1976 and changes of the rotation velocity within the solar cycle Differential rotation of sunspot groups in the period from 1874 through 1976 and changes of the rotation velocity within the solar cycle

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155...87b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 1, Jan. 1986, p. 87-98. Research supported by the Consejo Superior de

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163

Angular Velocity, Solar Cycles, Solar Rotation, Sunspots, Annual Variations, Computational Astrophysics, Meridional Flow

Scientific paper

An effort is made to determine the differential rotation of the sun on the basis of the complete sample (1874-1976) of the Greenwich Photoheliographic Results. In order to improve the representation of differential rotation, a modified fit formula whose constant lies at 15 deg latitude (where sunspots nearly always occur) is introduced. Rotation is noted to strongly depend on sunspot type, with C-groups exhibiting high velocities and H- and J-spots the lowest ones. The new fit formula indicates that the highest velocity is found around the minima; at the beginning of an activity maximum, there is a secondary velocity maximum. The lowest velocities lie between the activity maximum and minimum. The braking of recurrent sunspots is confirmed.

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