Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99...90w&link_type=abstract
Astronomy and Astrophysics, vol. 99, no. 1, June 1981, p. 90-96.
Astronomy and Astrophysics
Astrophysics
8
Balloon-Borne Instruments, Image Processing, Photosphere, Solar Atmosphere, Solar Granulation, Time Series Analysis, Brightness, Digital Data, Image Reconstruction, Power Spectra, Telescopes
Scientific paper
An analysis is presented of a time series of 17 high-resolution, computer processed solar granulation pictures, obtained during the 'Spektro-Stratoskop' project from an altitude of 28 km. On each negative, a rectangle of 29.7 x 44.6 arcsec (where 1 arcsec corresponds to 733.3 km on the sun) was scanned with a microphotometer, and the digitized intensities (200 x 300/frame) were corrected for instrumental blurring by means of a two-dimensional deconvolution. Numerical data were used to generate power spectra, correlation coefficients, brightness histograms, and contour plots, and a simplified morphological model was used to interpret the data. Major conclusions include the following: (1) granular rms brightness fluctuation at 500 nm equals 9.9%; (2) mean granular contrast at 500 nm equals 21.9%; (3) fractional area of granules equals 47.1%; and (4) the peak at 3.4/Mm exhibited by previous power spectra is resolved into three components with wavenumbers 2.0/Mm, 4.4/Mm, and 7.4/Mm.
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