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On the width distribution of penumbral filaments in sunspots

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Abstract

The mean width and distribution of penumbral filaments of a sunspot have been estimated, using white light photographs obtained with a vacuum, Newtonian type, telescope. Three areas corresponding to the penumbra of a sunspot have been analysed. Data were collected during the solar eclipse of June 1973. The photometric profiles of the Moon limb over the photosphere have been analysed to obtain useful information on both, atmospheric and instrumental perturbation on each exposure. The mean value of the width of penumbral filaments is 0.37 arc sec.

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Authors and Affiliations

  1. Instituto de Astrofísica de Canarias, C.S.I.C., Universidad de La Laguna, Tenerife, Spain

    J. A. Bonet, J. D. Ponz & M. Vazquez

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  1. J. A. Bonet
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  2. J. D. Ponz
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  3. M. Vazquez
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Now at INTA-Villafranca, S.T.S., P.O. Box 54065, Madrid, Spain.

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Bonet, J.A., Ponz, J.D. & Vazquez, M. On the width distribution of penumbral filaments in sunspots. Sol Phys 77, 69–75 (1982). https://doi.org/10.1007/BF00156096

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  • DOI: https://doi.org/10.1007/BF00156096

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