Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....77..347g&link_type=abstract
Astronomy and Astrophysics, vol. 77, no. 3, Aug. 1979, p. 347-350.
Astronomy and Astrophysics
Astrophysics
12
Atmospheric Effects, Light Transmission, Solar Terrestrial Interactions, Sunlight, Transparence, Velocity Measurement, Atmospherics, Doppler Effect, Earth Atmosphere, Radial Velocity, Solar Rotation
Scientific paper
It is noted that radial-velocity measurements in integrated sunlight are contaminated by atmospheric noise due to inhomogeneous transparency of earth's atmosphere along the line of sight to the solar disk. A measurement of the angular autocorrelation function of slow fluctuations in atmospheric transparency is described. It is shown that the typical coherence size is about 1 deg and independent of fluctuation amplitudes of 0.7 percent to 30 percent and that the angular autocorrelation function provides a link between global transparency variations and spurious measured velocities. It is concluded that all ground-based full-disk Doppler measurements should be carefully interpreted because atmospheric noise is present for periods greater than 5 min and less than about 90 min.
Brandt Patrick
Duebner F. L.
Fossat Eric
Grec Gerard
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