期刊
ASTROPHYSICAL JOURNAL
卷 798, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/798/2/100
关键词
line: profiles; methods: data analysis; Sun: chromosphere; Sun: photosphere
资金
- DFG [RE 3282/1-1, 787/3-1]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1413686] Funding Source: National Science Foundation
We present a fast (<< 1 s per profile) inversion code for solar Ca II lines. The code uses an archive of spectra that are synthesized prior to the inversion under the assumption of local thermodynamic equilibrium (LTE). We show that it can be successfully applied to spectrograph data or more sparsely sampled spectra from two-dimensional spectrometers. From a comparison to a non-LTE inversion of the same set of spectra, we derive a first-order non-LTE correction to the temperature stratifications derived in the LTE approach. The correction factor is close to unity up to log tau similar to -3 and increases to values of 2.5 and 4 at log tau = -6 in the quiet Sun and the umbra, respectively.
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