Coherence analysis of granular intensity |
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| Authors: | F J Kneer W Mattig A Nesis W Werner |
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| Institution: | (1) Kiepenheuer Institut für Sonnenphysik, Schöneckstr. 6, D-7800 Freiburg, F.R.G. |
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| Abstract: | A high resolution spectrogram of the Mg b2 line from the quiet Sun disc centre is subjected to a coherence analysis. We find that the coherence between intensity fluctuations in the continuum and the wings of the line breaks down at a distance   = 0.35 Å from line centre. From this and the r.m.s. intensity contrast as a function of we are led to the following simple model of temperature fluctuation  T in the solar photosphere: A lower part (below 50 km, or 
5000 > 0.25) with strongly inward increasing T and an upper part (above 50 km) with constant T = 75 K. The two parts are supposed to fluctuate incoherently.Mitteilungen aus dem Kiepenheuer Institut Nr. 166. |
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