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Motions and lifetimes of the penumbral bright grains in sunspots

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Abstract

It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. We find different proper motions of 0.08 to 0.33 km s−1 for different penumbrae and different reduction methods. The lifetimes of these bright grains are about 1.5 to 3 hr depending on the position in the penumbra.

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  1. Universitäts-Sternwarte, Geismarlandstr. 11, D-3400, Göttingen, F.R.G.

    Klara Tönjes & Hubertus Wöhl

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  1. Klara Tönjes
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  2. Hubertus Wöhl
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Tönjes, K., Wöhl, H. Motions and lifetimes of the penumbral bright grains in sunspots. Sol Phys 75, 63–69 (1982). https://doi.org/10.1007/BF00153459

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  • DOI: https://doi.org/10.1007/BF00153459

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