The empirical determination of damping constants in the solar photosphere. II - Results inferred from the wings of Fe I lines

Details The empirical determination of damping constants in the solar photosphere. II - Results inferred from the wings of Fe I lines The empirical determination of damping constants in the solar photosphere. II - Results inferred from the wings of Fe I lines

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...77..291g&link_type=abstract

Solar Physics, vol. 77, Apr. 1982, p. 291-297.

Physics

4

Damping, Fraunhofer Lines, Iron, Photosphere, Solar Atmosphere, Solar Physics, Solar Spectra, Spectral Line Width

Scientific paper

The empirical damping constants for 73 Fe I lines are determined using the method of Gurtovenko and Kondrashova (1980), employing high quality observations and an accurate list of Fe I oscillators strengths. It is shown that the traditional method of representing Fraunhofer lines requires large damping constants on the average of gamma = 3(gamma6)-4(gamma sub 6) for Fe I lines. The dependence of the enhancement factor on the line intensity indicates that it is not due to collisional damping, and it seems most probable that the properties of photospheric inhomogeneities cause a false extra damping effect, of which the magnitude generally increases with decreasing line intensity. The false damping effect is not seen in stronger lines, which yield an average damping constant of gamma not less than about 1.3(gamma6) and not greater than about 1.5(gamma sub 6).

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