Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..518a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 518-524. Research supported by the Universita di Fire
Astronomy and Astrophysics
Astrophysics
6
Line Spectra, Metallicity, Photosphere, Solar Oscillations, Calcium, Iron, Power Spectra, Two Dimensional Models
Scientific paper
Previous measurements carried out on four Fe I photospheric lines have suggested that the different oscillating power observed on the blue and red line flanks is produced by the intensity-velocity phase lag in the '5-min' waves. Former measurements and new additional observations on the 6149.2 A Fe II and 6162.2 A Ca I lines have been used to evaluate more accurately the dependence of this intensity-velocity phase difference on the photospheric height. A nonadiabatic and nonisothermal bidimensional model of the thermodynamic fluctuations induced in the photosphere by the high degree p-modes suggests that radiative damping might explain the observed line profile oscillations.
Alamanni N.
Bertello Luca
Cavallini Fabio
Ceppatelli Guido
Righini Alberto
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