Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..294v&link_type=abstract
Astronomy and Astrophysics, v.306, p.294
Astronomy and Astrophysics
Astrophysics
3
Sun: Photosphere, Sun: Granulation
Scientific paper
To study temperature and velocity fluctuations in the lower photosphere of the Sun, we analyzed spectrograms obtained with the Vacuum Tower Telescope of the Observatorio del Teide in Tenerife in a spectral range at about 410nm, the secondary minimum of the continuum absorption coefficient. We find much larger temperature fluctuations than deduced by previous investigations at almost all photospheric heights. The velocity fluctuations show the same height dependence as deduced by earlier studies at mid- and upper photospheric layers (at heights larger than about 100km above τ_0_=1), but they do not increase as rapidly with decreasing height in the lower photosphere. The results indicate the existence of a velocity maximum located at the bottom of the photosphere or slightly below in subphotospheric layers. The location of this maximum agrees reasonably well with predictions of convection zone models.
Komm Rudi
Mattig Wolfgang
Vollmoeller P.
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