Motions and lifetimes of the penumbral bright grains in sunspots |
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| Authors: | Klara Tönjes Hubertus Wöhl |
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| Institution: | (1) Universitäts-Sternwarte, Geismarlandstr. 11, D-3400 Göttingen, F.R.G. |
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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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