Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..689k&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 689-698.
Astronomy and Astrophysics
Astrophysics
12
Fraunhofer Lines, Frequency Shift, Photosphere, Solar Atmosphere, Solar Rotation, Solar Spectra, Convection, Line Of Sight, Power Spectra, Spectral Signatures, Velocity Measurement
Scientific paper
Transform techniques have been applied to a 1 yr sequence of solar photospheric Fraunhofer line shift data. In agreement with earlier studies, no evidence is found of large-scale structure in mean spatial power spectra near the level of 12 m/s. It is argued that such spectra are easily dominated by random supergranule noise, and that these data may even be used to estimate supergranule characteristics. By considering a rotation signal in the temporal transformed data, statistical evidence (at the 3 sigma level) is found of a large-scale, long-lived, photospheric line shift field. A simple model suggests spatial scales of 100,000-1,000,000 km, with lifetimes of at least 3 days and line shifts corresponding to velocity amplitudes near 2 m/s. While the interpretation of the residual line shift is not unambiguous, it is suggested that this is the Doppler velocity signature of large-scale convective cells.
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