Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..255b&link_type=abstract
Astrophysical Journal, Part 1, vol. 230, May 15, 1979, p. 255-260.
Astronomy and Astrophysics
Astrophysics
3
Luminous Intensity, Solar Limb, Solar Oscillations, Brightness, Solar Atmosphere, Solar Observatories, Stellar Envelopes
Scientific paper
Observations of the continuum intensity near the solar limb are used to estimate the power in fluctuating brightness as a function of spatial and temporal frequency and distance from the limb. This presentation of the data clearly discriminates between atmospheric and solar effects, and shows that brightness oscillations are indeed present on the sun. Most power lies below 1.5 mHz or betweeen 3.0 and 5.0 mHz, and at wavelengths longer than 5 Mm. Amplitudes per frequency-wavenumber resolution element range downward from one thousandth the disk-center intensity. The oscillation amplitude apparently increases with distance inward from the limb, indicating that the contribution from a high, optically thin shell cannot be very important.
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