New observations of the granular intensity fluctuations

Details New observations of the granular intensity fluctuations New observations of the granular intensity fluctuations

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..167d&link_type=abstract

Astronomy and Astrophysics, vol. 45, no. 1, Dec. 1975, p. 167-171.

Astronomy and Astrophysics

Astrophysics

61

Astronomical Photography, Luminous Intensity, Power Spectra, Solar Eclipses, Solar Granulation, Spectral Energy Distribution, Astronomical Models, Error Analysis, Mathematical Models, Reflecting Telescopes

Scientific paper

White-light photographs of solar granulation obtained with a 40-cm evacuated reflector during the partial eclipse of June 30, 1973, are used for a statistical analysis of granular intensity fluctuations. Two-dimensional power spectra of the intensity distribution are calculated directly, and an instrument spread function derived from photometric scans across the lunar limb is employed for correcting the data. The mean FWHM of the spread function corresponded to 0.52 sec. The corrected RMS intensity fluctuation is found to be 0.128 for a wavelength of 607 nm, and maximum power is found to occur at the wave number corresponding to a wavelength of 1340 km or 1.85 sec.

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