Influence of NLTE calculations on the hydrogen lines in chromospheric models

Details Influence of NLTE calculations on the hydrogen lines in chromospheric models Influence of NLTE calculations on the hydrogen lines in chromospheric models

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...452.1083f&link_type=abstract

Astronomy and Astrophysics, Volume 452, Issue 3, June IV 2006, pp.1083-1088

Astronomy and Astrophysics

Astrophysics

7

Line: Formation, Sun: Chromosphere

Scientific paper

We present extensive NLTE calculations for a semi-empirical solar 1D chromosphere model based on the VAL C model. We report on a significant influence of nitrogen, oxygen, and sulfur on the emergent hydrogen emission with respect to LTE vs. NLTE calculations for these elements. Moreover, we present a model spectrum with 20 light and iron group elements computed in NLTE. We compare this to an observed solar spectrum and to a photospheric model spectrum. We find that the agreement for this model with the data is less good than the original VAL C model especially in the UV. This may imply the need of changes in the chromospheric temperature structure or may point to general problems of static 1D chromospheric models.

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