Structure of the solar granulation

Details Structure of the solar granulation Structure of the solar granulation

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..107...11r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 107, no. 1, 1987, p. 11-26.

Physics

58

Benard Cells, Solar Granulation, Astronomical Photography, Digital Filters, Fast Fourier Transformations, High Resolution, Power Spectra, Solar Limb

Scientific paper

The structure of the solar granulation has been analyzed using computer-processed images of two very high resolution (0.25 arcsec) white-light pictures obtained at the Pic-du-Midi Observatory. The narrow dispersion in the distribution of granule sizes is not confirmed. On the contrary, it is found that the number of granules increases continuously toward smaller scales; this means that the solar granulation has no characteristic or mean scale. Nevertheless, the granules appear to have a critical scale of 1.37 arcsec at which drastic changes in the properties of granules occur; in particular the fractal dimension changes at the critical scale. The granules smaller than this scale could be of turbulent origin.

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