Bibcode
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 citas
227
Número de citas referidas
212
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.