Solar granulation study in partial eclipse conditions using speckle interferometric techniques

Details Solar granulation study in partial eclipse conditions using speckle interferometric techniques Solar granulation study in partial eclipse conditions using speckle interferometric techniques

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..114r&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 114-121.

Astronomy and Astrophysics

Astrophysics

13

Interferometry, Solar Eclipses, Solar Granulation, Speckle Patterns, Coordinate Transformations, Data Reduction, Electron Transfer, Lunar Limb, Power Spectra, Signal To Noise Ratios, Spatial Distribution

Scientific paper

During the partial eclipse of April 29, 1976, photoelectric speckle-interferometric measurements of solar granulation were obtained using the 35 cm domeless coudé refractor of the Kiepenheuer Institute, operated at the Anacapri Island observatory.
A radial cut of the two-dimensional power spectrum of the intensity distribution was calculated and the empirical modulation transfer function (M.T.F.), determined from the lunar limb profile, was used for correcting the data. This experimental M.T.F. which contains the combined effects of instrumental diffraction and atmospheric seeing is found to be in very good agreement with Korff's theoretical model computed for a Fried parameter r0 equal to 2.3 cm.
The corrected intensity fluctuation (ΔI)r.m.s.= 16.5% for λ=5300 A. The maximum power is found to be split into two components located respectively at 0.2 and 0.4 cycles per arc second. The shape of the power spectrum confirms the fall in energy towards very low spatial frequencies, whereas the poor precision obtained in the high frequency range cannot permit an exponential decrease of the solar granulation power spectrum to be confirmed or refuted.

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