Characteristics of the Displacement of the Penumbral Bright Grains of Sunspots
Abstract
It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. At the umbra-penumbra boundary their horizontal velocity is about 0.5 km s−1 and their displacement is inclined downwards with an angle of 5° to 20°.
- Publication:
-
Solar Physics
- Pub Date:
- May 1976
- DOI:
- 10.1007/BF00153335
- Bibcode:
- 1976SoPh...48..101M
- Keywords:
-
- Horizontal Velocity;
- Sunspot Umbra;
- Incline Downward