Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...73...25h&link_type=abstract
Solar Physics, vol. 73, Sept. 1981, p. 25-35. Research supported by the Bundesministerium für Forschung und Technologie.
Physics
Astronomical Photography, Periodic Variations, Power Spectra, Solar Granulation, Data Reduction, Photosphere, Spaceborne Photography, Spectrum Analysis
Scientific paper
From a sequence of white-light photographs of solar granulation at the center of the disk, obtained by Spectro-Stratoscope on May 17, 1975, two-dimensional spatial power spectra of photospheric intensity fluctuations were deduced. These show periodicities of approximately 1000 s, 250-450 s (5-min oscillation), and shorter ones in the range 30-120 s. The reality of the shorter periods, however, seems to be questionable. The weighted mean wavenumber of the spatial power spectra and rms of the intensity fluctuation are also computed, and show the same periodicities as the power.
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