Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...221..137r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 221, no. 1, Aug. 1989, p. 137-145.
Astronomy and Astrophysics
Astrophysics
18
Benard Cells, Fourier Analysis, Solar Granulation, Solar Rotation, Angular Velocity, Latitude, Power Spectra, Size (Dimensions), Velocity Distribution
Scientific paper
A Fourier analysis of supergranular velocity fields measured at different heliographic latitudes is discussed. Line-of-sight components of the supergranular velocity field were measured with the aid of Doppler shifts of the photospheric absorption line Fe I lambda = 5576 A determined using a Doppler-compensating servosystem. Evidence is found for a decrease of the mean cell diameter of the supergranulation toward higher latitudes. The results show a mean cell size of 37,800 + or - 460 km for the equator belt, a minimum value of 33,700 + or - 330 km for latitudes around 45 deg, and increasing cell size values toward higher latitudes. No variation of rms velocities with latitude is noted.
Rimmele Th.
Schroeter E. H.
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