Lifetimes and motions of penumbral grains.
Abstract
The properties of penumbral grains (PGs) are studied from a 4.5 hour sunspot series observed on June 5, 1993 at the Swedish Vacuum Solar Telescope, La Palma. The application of an image segmentation procedure yields a set of 605 penumbral grains which are investigated by a feature tracking algorithm. The authors find a dividing line between inward and outward moving PGs and give results on their lifetime and proper motion.
- Publication:
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JOSO Annu. Rep., 1998
- Pub Date:
- 1999
- Bibcode:
- 1999joso.proc...89S
- Keywords:
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- Sunspots: Penumbrae