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Title:
Photospheric line asymmetry and granular velocity models
Authors:
Keil, S. L.; Yackovich, F. H.
Affiliation:
AA(Sacramento Peak Observatory, Sunspot, N. Mex.), AB(Pennsylvania State University, University Park, Pa.)
Publication:
Solar Physics, vol. 69, Feb. 1981, p. 213-221. (SoPh Homepage)
Publication Date:
02/1981
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Asymmetry, Line Spectra, Solar Granulation, Velocity Distribution, Solar Physics, Spatial Resolution
DOI:
10.1007/BF00149989
Bibliographic Code:
1981SoPh...69..213K

Abstract

Spectral line profiles obtained from regions of the solar surface exhibiting either an upflow or a downflow on a spatial and temporal scale corresponding to the white-light granulation are analyzed. The differences between their line bisectors are measured to quantify changes in the asymmetry of the profile resulting from granular motion. The observed bisector differences are compared with differences predicted using conflicting granular models. Models in which the motion of large, long-lived granules decreases rapidly with increasing height in the photosphere are compatible with the observed line profile asymmetries.

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Database: Astronomy
Physics
arXiv e-prints