Motions and lifetimes of the penumbral b
β
Klara TΓΆnjes; Hubertus WΓΆhl
π
Article
π
1982
π
Springer
π
English
β 561 KB
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 penum