On the magnitude and the height dependence of the granular vertical flow velocity

Details On the magnitude and the height dependence of the granular vertical flow velocity On the magnitude and the height dependence of the granular vertical flow velocity

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111l...1b&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 1, July 1982, p. L1-L3.

Astronomy and Astrophysics

Astrophysics

16

Flow Velocity, Solar Granulation, Solar Spectra, Vertical Motion, Brightness, Data Reduction, Line Spectra, Modulation Transfer Function, Photosphere, Power Spectra

Scientific paper

Granular velocities determined from excellent quality solar spectra in two spectral lines are corrected for instrumental and atmospheric image degrading effects by the application of a modulation transfer function derived from the same material by comparing the observed brightness fluctuation spectra with various true spectra from the literature. k-omega spectra are used to separate granular and oscillatory fluctuations. The results favor a rather flat gradient with photospheric (C I 5380 line) rms granular velocities of at least 1.0 km/sec

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