Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..263c&link_type=abstract
Astronomy and Astrophysics, vol. 50, no. 2, July 1976, p. 263-272.
Astronomy and Astrophysics
Astrophysics
20
Chromosphere, K Lines, Solar Spectra, Stellar Models, Fine Structure, Solar Atmosphere, Solar Granulation
Scientific paper
This paper discusses a synthetic, time-dependent multicomponent model for the formation of the chromospheric Ca II K line. The equations describing the conservation of mass, momentum and energy in a compressible fluid are solved to obtain the nonlinear dynamical response of a model chromosphere excited by sinusoidal oscillations. A non-LTE radiation transfer problem for a three-level model of the Ca II ion is solved to obtain the time evolution of the K and 8542 line profiles emerging from the moving atmosphere. The agreement between the temporal evolution of the theoretical K-line profile and the observed time-sequence behavior of a class of chromospheric fine structures known as K-grains supports recent suggestions that the K-grains are sites of local heating due to the dissipation of an acoustic energy flux.
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