Some effects of acoustic waves on spectral-line profiles

Details Some effects of acoustic waves on spectral-line profiles Some effects of acoustic waves on spectral-line profiles

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..768c&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 768-774.

Astronomy and Astrophysics

Astrophysics

20

Acoustic Propagation, Atmospheric Models, Line Shape, Radiative Transfer, Solar Atmosphere, Atmospheric Heating, Atmospheric Turbulence, Chromosphere, Photosphere, Spectral Line Width, Stellar Models

Scientific paper

The paper discusses the formation of spectral lines in the presence of short-period, nonlinear, radiatively damped acoustic waves propagating through a model of the solar atmosphere. The temperature and pressure perturbations associated with the wave strongly influence the line profile. Although their wavelength is less than the depth of the velocity response function of photospheric spectral lines, the acoustic waves produce large (greater than 100 m/s), short-period line shifts. Acoustic waves of sufficient amplitude to account for chromospheric heating do not significantly increase the equivalent widths of photospheric lines and therefore are probably not responsible for photospheric microturbulence.

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