Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..161c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 161-166. Research supported by the Universitadi Fire
Astronomy and Astrophysics
Astrophysics
12
Iron, Line Shape, Photosphere, Solar Atmosphere, Solar Oscillations, Power Spectra, Solar Magnetic Field, Vertical Distribution
Scientific paper
Former observations carried out at the center of the solar disk on three Fe I photospheric lines have shown that, during the 5-min oscillation, the bisector and the line flanks show an oscillation amplitude decreasing in a different way from the line core to the continuum. New observations, obtained in a magnetically insensitive line, in and outside the disk center, confirm the previous findings. From these and the former measurements it follows that the ratio between the Vrms of the blue and the red flanks in the observed lines depends on the height in the photosphere. This result may be qualitatively interpreted as due to the coupling of the velocity and brightness oscillations in the 5-min waves, and its height dependence as due to a phase effect.
Alamanni N.
Cavallini Fabio
Ceppateli G.
Righini Alberto
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