Motions and Lifetimes of the Penumbral Bright Grains in Sunspots
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.
- Publication:
-
Solar Physics
- Pub Date:
- January 1982
- DOI:
- 10.1007/BF00153459
- Bibcode:
- 1982SoPh...75...63T
- Keywords:
-
- Astronomical Photography;
- Penumbras;
- Solar Granulation;
- Sunspots;
- Dynamic Characteristics;
- Photosphere;
- Time Response;
- Umbras;
- Solar Physics;
- Reduction Method;
- Proper Motion;
- Sunspot Umbra