Query : 2006A&A...452.1083F

2006A&A...452.1083F - Astronomy and Astrophysics, volume 452, 1083-1088 (2006/6-4)

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


Abstract (from CDS):

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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Journal keyword(s): line: formation - Sun: chromosphere

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