Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..123y&link_type=abstract
(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations
Astronomy and Astrophysics
Astronomy
3
Atmospheric Tides, Limb Darkening, Solar Limb, Solar Oscillations, Solar Terrestrial Interactions, Atmospheric Effects, Brightness Distribution, Photosphere, Power Spectra
Scientific paper
Fluctuations of the maximum brightness gradient in apparent-solar-limb-darkening profiles obtained during good seeing conditions on June 11-14, 1981, in 3200-arcsec/sec scans (40 scans/sec extended 43 arcsec) are presented in a power spectrum with 2-microhertz resolution and compared with published observations of 5-min solar oscillations. Two periods in the 5-min range (at 3.234 and 3.435 mHz) are detected above the 3-sigma confidence level and attributed to oscillations of the terrestrial atmosphere, either rapidly damped stochastically excited gravity waves or permanent oscillations of unknown origin which are detectable only under good seeing conditions. The need to take such atmospheric effects into account in interpreting solar-oscillation observations is stressed.
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