Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..960h&link_type=abstract
Astronomy and Astrophysics 288, 960-966 (1994)
Astronomy and Astrophysics
Astrophysics
12
Lines: Profiles, Sun: Photosphere, Granulation
Scientific paper
Using four selected examples of bisector and line parameter variations due to granular/intergranular motions in the solar photosphere, we investigate in this paper the coherence between these parameters over single granular/intergranular areas. It is shown, that there is no definite correlation between intensity variations, velocity variations and the shape of the respective bisectors. This is in contradiction to some model calculations but is consistent with the results extracted from spatially highly resolved spectrograms in previous papers. We found enhancements of the line parameter full width at half maximum at the granular/intergranular border, non symmetric intensity and velocity variations around their maxima or minima values and a correlation between velocity variations on the horizontal scale with the full width at half maximum values (δfw). However, there is no correlation between δfw and continuum intensity, because the enhancement of δfw occurs at moderate values of continuum intensity. Since the full width at half maximum indicates enhanced non thermal motions, these areas are the location of post shock turbulence as it is described by newer hydrodynamical models. These examples are of course influenced by subjective selection but should be on the other hand also described by hydrodynamical model calculations.
Hanslmeier Arnold
Mattig Wolfgang
Nesis Anastasios
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