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The variation of the mean size of the photospheric granules close to and away from a sunspot

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Abstract

We study the mean size of granules as a function of distance from the boundaries of the sunspot penumbra. We use for the determination of the mean size two different methods, a visual and a photometric. In all cases the mean diameter of the granules away from the spot was greater than the mean diameter of the granules in the neighbourhood of the penumbra. Our study is based on an excellent sequence of photos, taken at the Pic-du-Midi Observatory on May 11, 1979.

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Authors and Affiliations

  1. Observatoire du Pic-du-Midi, F-65200, Bagnères de Bigorre, France

    R. Muller

  2. Astronomical Institute, National Observatory of Athens, P.O. Box 20048, 11810, Athens, Greece

    C. Macris, Th. Prokakis & D. Dialetis

Authors
  1. C. Macris
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  2. Th. Prokakis
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  3. D. Dialetis
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  4. R. Muller
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Macris, C., Prokakis, T., Dialetis, D. et al. The variation of the mean size of the photospheric granules close to and away from a sunspot. Sol Phys 122, 209–213 (1989). https://doi.org/10.1007/BF00912992

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  • DOI: https://doi.org/10.1007/BF00912992

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