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Characteristics of the displacement of the penumbral bright grains of sunspots

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Abstract

It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. At the umbra-penumbra boundary their horizontal velocity is about 0.5 km s−1 and their displacement is inclined downwards with an angle of 5° to 20°.

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

    R. Muller

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  1. R. Muller
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Muller, R. Characteristics of the displacement of the penumbral bright grains of sunspots. Sol Phys 48, 101–102 (1976). https://doi.org/10.1007/BF00153335

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  • DOI: https://doi.org/10.1007/BF00153335

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