Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..509b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 509-517. Research supported by CNR.
Astronomy and Astrophysics
Astrophysics
10
Fraunhofer Lines, Line Spectra, Solar Oscillations, Solar Spectra, Doppler Effect, Magnetoacoustics, Magnetohydrodynamics, Solar Temperature
Scientific paper
A realistic form of the temperature, pressure, and velocity perturbations representing the '5-min' oscillations with a monochromatic bidimensional wave in the solar photosphere is derived and used to compute the oscillations of typical Fe I and Fe II line profiles. Results demonstrate the role of radiative damping in producing different amplitudes of the oscillation in the opposite flanks of the lines, by causing a depth-dependent phase difference between the thermodynamical and the velocity perturbations. A comparison of results obtained with wave models with observations showed that an agreement can be obtained along the whole profile of the Fe I and Fe II lines, provided that 0th order temperature gradients are taken into acccount.
Bertello Luca
Caccin Bruno
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