Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..381c&link_type=abstract
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 381, 1992
Astronomy and Astrophysics
Astrophysics
15
Sun (The): Photosphere Of, Convection, Meridional Motion, Spectroscopy
Scientific paper
A large number of spectroscopic measurements of meridional mass motion on the Sun has been carried out in the past. The results are rather contradictory, although a 10 ms-1 poleward flow might be inferred. Some authors have pointed out that the so called "meridional motion" might be ascribed to a latitudinal dependence of the convective flux. In this paper we describe new observations carried out with the spectro-interferometer installed at the G.B. Donati Solar Tower in Arcetri: these measurements have been performed using lines having either similar or very different physical parameters in order to disentangle convective effects from true mass flows. We discuss the results and we conclude that the great variety of "meridional motions" so far observed by spectroscopic means may be ascribed to an intrinsic variability of the meridional flow pattern and in part to the presence of a large scale velocity field.
Cavallini Fabio
Ceppatelli Guido
Righini Alberto
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