Other
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986crasb.302..871r&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Other
9
Convection, Dynamo Theory, Meridional Flow, Solar Cycles, Solar Magnetic Field, Sunspots, Angular Momentum, Plasma Dynamics, Rotating Fluids, Solar Prominences, Solar Rotation
Scientific paper
A large-scale circulation pattern has been detected in the solar convective zone, for the first time. Tracers used to probe the convective layers are newly-born sunspots and long-lived Hα filaments. Young sunspots trace a roughly axisymmetric circulation in the form of four zonal bands, with a velocity amplitude ranging from zero to 100 m s-1. The coincidence of the zonal meridional circulation with the magnetic pattern drawn by the Hα filaments suggests that we are looking at rotating rolls. The direction of rotation is associated with the magnetic polarity. Another result concerns the rotational rate of the deep convective layers. Young spots seem to rotate more rigidly, in contrast with older spots which exhibit a differential rotation similar to the surface rotation. However, the rotational rate exhibits a large dispersion, partly due to young spots located at the site of converging of diverging rolls. This is the consequence of the Coriolis force which decelerates or accelerates the plasma. These results shed a completely new light on problems dealing with the differential rotation, the transport of angular momentum and the dynamo action.
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