Two-dimensional models of the solar chromosphere. I - The CA II K line as a diagnostic: 1.5-D radiative transfer

Details Two-dimensional models of the solar chromosphere. I - The CA II K line as a diagnostic: 1.5-D radiative transfer Two-dimensional models of the solar chromosphere. I - The CA II K line as a diagnostic: 1.5-D radiative transfer

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..220s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 220-234.

Astronomy and Astrophysics

Astrophysics

41

Chromosphere, K Lines, Solar Atmosphere, Stellar Models, Two Dimensional Models, Calcium, Radiative Transfer, Solar Magnetic Field

Scientific paper

Ca II K line calculations for a 5-level atom and partial frequency redistribution along multiple rays passing through 2D MHD models of magnetic flux tubes in the solar atmosphere are presented. Temperature stratifications corresponding to various empirical chromospheric models are incorporated into the models. The influence of a number of model parameters on individual and spatially averaged line profiles is considered in detail. The profiles are also compared with observations. It is found that the present models can, at least qualitatively, reproduce a wide variety of observations if the temperature within the magnetic component lies between that of model F of Vernazza et al. (1981) and of model VALP of Ayres et al. (1986) and if the temperature in the nonmagnetic part of the atmosphere corresponds to that of the COOLC model of Ayres et al. Observations that are consistent with this model are presented.

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