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Spectral analyses of solar photospheric fluctuations

IV: The low-wavenumber power of granulation brightness fluctuations

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Abstract

Synthetic one-dimensional scans of brightness fluctuations are generated from intergranulegranule profiles (IGP), which approximate observed scans of granulation fluctuations except that the local (i.e. IGP) mean intensity is kept constant. Comparing the power spectrum of such scans with the power spectrum of observed scans shows that nearly two thirds of the low-wavenumber (k < 0.0025 km-1) granulation power is due to this variable mean effect. This result favors the interpretation of granulation as turbulent thermal convection but cannot rule out the laminar convection interpretation.

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Authors and Affiliations

  1. Dept. of Astronomy, The University of Texas at Austin, Austin, U.S.A.

    Frank N. Edmonds Jr.

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  1. Frank N. Edmonds Jr.
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Edmonds, F.N. Spectral analyses of solar photospheric fluctuations. Sol Phys 44, 293–297 (1975). https://doi.org/10.1007/BF00153209

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  • DOI: https://doi.org/10.1007/BF00153209

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