Abstract
We present an overview of our recent results about solar granulation and mesogranulation, obtained with Pic du Midi observations. These results were obtained during 1986–1990 using image and spectrographic analysis of high spatial resolution data. The study of the solar granulation, with 2 Dim. “Multichannel Subtractive Double Pass” (M.S.D.P.) spectra, shows a clear change of the dynamical regime at 3″ ( ⋍ 2200 km ) of the photospheric velocity field when oscillatory components are filtered out. A three hour movie obtained on film at Pic du Midi Observatory and analyzed at the Lockheed Research Laboratory and the National Solar Observatory (Sacramento Peak) was used to calculate the horizontal flow pattern. The mean lifetime of the diverging areas related to mesogranulation is estimated at 3 hours; these diverging areas are swept by the supergranulation flow towards the supergranule boundary with a mean speed of 0.4 km/s.
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