The mean vertical velocity of solar granulation

Details The mean vertical velocity of solar granulation The mean vertical velocity of solar granulation

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..129m&link_type=abstract

Astronomy and Astrophysics, vol. 83, no. 1-2, Mar. 1980, p. 129-132.

Astronomy and Astrophysics

Astrophysics

5

Atmospheric Turbulence, Solar Granulation, Correction, Power Spectra, Spectrum Analysis, Vertical Motion

Scientific paper

Direct measurements of vertical granular velocity fluctuations in spatially resolved spectrograms and the methods of their correction for the influence of atmospheric and instrumental smearing are critically discussed. An independent correction of the observations by Canfield and Mehltretter (1973) and by Keil and Canfield (1978) is reported. A vertical granular velocity component (without the oscillations) of 0.8-1.2 km/s (rms) is obtained, which is very weakly dependent on height. These values are larger than the theoretical predictions by Nelson and Musman (1977) and constitute the main component of local 'macroturbulent' broadening of unresolved line profiles.

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