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

Bibcode
1986A&A...155...87B
Balthasar, H.; Vazquez, M.; Woehl, H.
Referencia bibliográfica

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

Fecha de publicación:
1
1986
Número de autores
3
Número de autores del IAC
2
Número de citas
225
Número de citas referidas
210
Descripción
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.
Tipo
Con árbitro
Rotación solar
Manchas solares

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