Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..144k&link_type=abstract
Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 144-151.
Astronomy and Astrophysics
Astrophysics
9
Atmospheric Circulation, Atmospheric Models, Line Spectra, Solar Atmosphere, Solar Spectra, Spectrum Analysis, Solar Granulation, Velocity Distribution, Weighting Functions
Scientific paper
The accuracy of height-dependent photospheric velocity fields inferred from observed line shifts by the use of velocity weighting (response) functions is evaluated. Several Fe I profiles for lines near 5150 A are synthesized by using an atmospheric model which includes horizontal fluctuations in temperature and velocity as well as a vertical differential velocity field. For assumed geometries of the granular and oscillatory motions, root-mean-square velocity fluctuations are synthesized and compared with predictions based on the velocity weighting functions. It is found that the line synthesis analysis required larger amplitude granular velocity fluctuations deep in the photosphere and a more rapid fall off with height than those obtained by analyzing the same data with velocity weighting functions. Simple models for the height dependence of the velocity field are used to determine when the assumptions upon which the use of velocity weighting functions are based are no longer valid.
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