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UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM
We detected peaks of oscillatory power at 3 and ~6.5 minutes in the umbra of the central sunspot of the active region NOAA AR 10707 in data obtained in the near-infrared (NIR) continuum at 1565.7 nm. The NIR data set captured umbral dynamics around 50 km below the Delta *t500 = 1 level. The umbra do...
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Published in: | The Astrophysical journal 2011-08, Vol.736 (2), p.79-jQuery1323905283364='48' |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We detected peaks of oscillatory power at 3 and ~6.5 minutes in the umbra of the central sunspot of the active region NOAA AR 10707 in data obtained in the near-infrared (NIR) continuum at 1565.7 nm. The NIR data set captured umbral dynamics around 50 km below the Delta *t500 = 1 level. The umbra does not oscillate as a whole, but rather in distinct parts that are distributed over the umbral surface. The most powerful oscillations, close to a period of ~6.5, do not propagate upward. We noted a plethora of large umbral dots (UDs) that persisted for >=30 minutes and stayed in the same locations. The peaks of oscillatory power above the detected UDs are located at 3 and 5 minute oscillations, but are very weak in comparison with the oscillations of ~6.5 minutes. |
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ISSN: | 0004-637X 1538-4357 |
DOI: | 10.1088/0004-637X/736/2/79 |