ASTRONOMY AND ASTROPHYSICS Cycle 19 facula dynamics
نویسنده
چکیده
We investigated the meridional circulation of photospheric faculae throughout cycle 19. Together with the rotation observed in a companion paper (Meunier et al. 1996), we were able to address the problem of the existence of the observed differential rotation. Themeridional circulation is characterized by a strong north-south asymmetry. The distribution of meridional circulation around the mean value confirms the existence of two populations detected in Meunier et al. (1996). An investigation of the rms velocities yields information on the variation of the anisotropy between the two horizontal motions and the latitudinal dependence of the small-scale kinetic energy. Lastly, a very small facula covariance has been measured, and its variation during the cycle has been established.
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