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| Paper: |
Persistent Circulating Motion in a Sunspot Umbra |
| Volume: |
454, The 3rd Hinode Science Meeting |
| Page: |
213 |
| Authors: |
Katsukawa, Y.; Kitai, R.; Watanabe, H. |
| Abstract: |
We studied temporal evolution of flow patterns inside an umbra
using the local correlation tracking algorithm applied to
long-term filtergram data of a matured sunspot taken with
the Hinode Solar Optical Telescope. We found not only
inward migration of umbral dots in a peripheral region of the
umbra but also a circulating motion in a central region of
the umbra. The circulating motion was persistently observed
for at least 3 days. The observation suggests that there
are magnetic and flow structures below a sunspot maintaining
the motion of umbral dots. |
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