On the power spectrum of the solar granulation at high wavenumbers

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interferometry, Power Spectra, Solar Granulation, Solar Spectra, Atmospheric Effects, Data Reduction, Electrophotometry, Modulation Transfer Function, Solar Limb, Speckle Patterns, Telescopes, Wave Front Reconstruction

Scientific paper

Using the McMath solar telescope and the combined techniques of photoelectric speckle interferometry and wave-front division interferometry, the two-dimensional power spectrum of the solar granulation for spatial frequencies between one and two cycles per arcsecond has been determined. The effective modulation transfer function of the telescope-atmosphere-scanning slit combination has been determined under the assumption that the main effect of the atmosphere is to cause separate tilts of the two sections of the divided wave-front over their respective apertures. Statistical information on this tilting has been determined from limb data. The quantitative results of the observations and the calibration indicate that there is a significant amount of power in this spatial frequency range.

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