Abstract
The structure of sunspot penumbrae is discussed in terms of bright filaments on a dark background, as opposed to dark filaments above a bright granular background.
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Muller, R. On the structure of sunspot penumbra. Sol Phys 98, 51–52 (1985). https://doi.org/10.1007/BF00177198
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DOI: https://doi.org/10.1007/BF00177198