Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..129k&link_type=abstract
Astronomy and Astrophysics, vol. 113, no. 1, Sept. 1982, p. 129-134.
Astronomy and Astrophysics
Astrophysics
10
Brightness Distribution, Fourier Analysis, Power Spectra, Solar Oscillations, Solar Spectra, Filtergrams, Solar Atmosphere, Solar Granulation
Scientific paper
The results of a Fourier analysis of observations of brightness fluctuations in a sequence of CN 3883 Angstrom filtergrams are presented. From the 75 min time interval and field of view of 170 x 220 sq arcsec, a 40 sec sampling interval was examined, maintaining a spatial resolution as high as 1600 km. The data is filtered for a high wavenumber power spectrum, and an average power coefficient is calculated by examining power spectra for each of the sub-arrays. It is concluded that the 5 min velocity oscillation modal structure is easily detected in brightness fluctuations in the CN band, the surface gravity mode is the strongest single feature aside from the zero frequency ridge caused by convection, and the trapped chromospheric mode may be represented by a constant frequency ridge. Improved broad band filtergrams may be used to analyze little explored regions of the oscillation spectrum and to interpret intensity fluctuations as temperature fluctuations.
Kneer Franz
Newkirk Gordon Jr.
von Uexkuell M.
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