Vertical structure of the solar photosphere. II - The small-scale velocity field

Details Vertical structure of the solar photosphere. II - The small-scale velocity field Vertical structure of the solar photosphere. II - The small-scale velocity field

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..272d&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 2, July 1982, p. 272-278.

Mathematics

Probability

27

Atmospheric Temperature, Photosphere, Solar Atmosphere, Spectral Line Width, Brightness Distribution, Power Spectra, Probability Density Functions, Velocity Distribution

Scientific paper

Measurements of solar line shifts in spectra obtained during the Spektrostratoskop balloon flight of 1975 are described. By averaging the shifts of several lines, the noise level that is particularly apparent in measurements of single weak lines is strongly reduced, and line shift measurements extremely close to the continuum level are possible. An account is given of two investigations. In the first, oscillations are removed by spatial filtering, and the probability density distribution of the velocity field is then compared with that of the continuum brightness fluctuations, that is, the granulation. The histograms for brightness and velocity in the deepest atmospheric layers are very similar, and they show a consistent departure from a normal distribution. In the upper atmosphere, the velocity histogram is more variable, and systematic behavior is not observed. In the other investigation, the correlation between the velocity fields at different levels and between the velocity and brightness field at the base of the atmosphere is studied by means of a coherence analysis.

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