Spatial variations in the Li I λ671 nm resonance line in two-dimensional artificial granulation.

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Solar Granulation: Numerical Simulations, Solar Granulation: Lithium, Solar Granulation: Resonance Lines

Scientific paper

Spectral observations of the Li I 671 nm resonance line with high spatial resolution were simulated based on time-dependent series of 2-D solar model atmospheres and the LTE approach. They do not confirm the conclusion of Kiselman (1997, 1998) that the LTE synthesis of this line produces an extremely different correlation between spatial variations of equivalent width and corresponding continuum intensity compared with the NLTE simulation and actual observations. The cause of such a discrepancy with Kiselman's results may be different atmospheric stratification of fluctuations in the thermodynamic quantities in the models used. Simpler single-scale (one-cell) simulations or the fully unstable models with unevolved flows are shown to have a quasi-columnar structure which extends over almost the whole model photosphere; they also produce spectral LTE result in close agreement with Kiselman's LTE plots.

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