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Title:
Short term profile variations of three Fe I photospheric lines in solar quiet regions at the disk center
Authors:
Cavallini, F.; Ceppatelli, G.; Righini, A.; Alamanni, N.
Affiliation:
AA(Arcetri, Osservatorio Astrofisico, Florence, Italy), AB(Arcetri, Osservatorio Astrofisico, Florence, Italy), AC(Firenze, Università, Florence, Italy), AD(Firenze, Università, Florence, Italy)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 310-314. Research supported by the Universita di Firenze and Osservatorio di Arcetri. (A&A Homepage)
Publication Date:
02/1986
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Iron, Line Spectra, Photosphere, Solar Oscillations, Solar Spectra, Fraunhofer Lines, K Lines, Power Spectra
Bibliographic Code:
1986A&A...156..310C

Abstract

Recent measurements of the 7699 Å K I line by other authors have shown that the line asymmetry, during the 5-min oscillations, varies in an tiphase with the line shift. We have measured, at the center of the solar disk, the bisector variations of three Fe I photospheric lines at 6297.8 Å, 6301.5 Å and 6302.5 Å. The oscillating power of the line bisectors and of the line flanks is distributed in several modes, the highest one is at 3.45mHz. The power decreases along the bisector from the line core to the continuum, confirming previous results on the 7699 Å K I line. The oscillating power, at equal intensity levels in all the three observed lines, is generally different in the two line flanks, and it decreases differently from the line core to the continuum.

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