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Motions and lifetimes of the penumbral bright grains in sunspots

✍ Scribed by Klara Tönjes; Hubertus Wöhl

Publisher
Springer
Year
1982
Tongue
English
Weight
561 KB
Volume
75
Category
Article
ISSN
0038-0938

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✦ Synopsis

It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. We find different prope r 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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