Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143...99k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 99-101. Translation.
Astronomy and Astrophysics
Astrophysics
5
Line Of Sight, Narrowband, Solar Atmosphere, Solar Oscillations, Spatial Filtering, Velocity Measurement, Spectrographs
Scientific paper
A further improvement upon the differential method is reported, which permits to achieve narrowband filtering of the spatial harmonics in the K = 0.1 - 5 (Mm)-1 range with an accuracy better than 0.2 m s-1. Preliminary observations have demonstrated that the amplitude of the spatial harmonics falls off rapidly as the wavelength λ decreases from 20arcsec down to 8arcsec. A maximum for λ = 24arcsec is observed, that is most likely associated with supergranulation. At the center of the solar disk, no large-scale meridional flows with oscillation amplitude Vm ≥ 0.2 km s-1 were detected.
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