천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제43권2호
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- Pages.47.2-47.2
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- 2018
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- 1226-2692(pISSN)
The Observational Evidence for the Internal Excitation of Umbral Velocity Oscillations
- Cho, Kyuhyoun (Seoul National University) ;
- Chae, Jounchul (Seoul National University)
- 발행 : 2018.10.10
초록
The umbral oscillations of velocity are commonly observed in the chromosphere of a sunspot. Their sources are considered to be either the external p-mode driving or the internal excitation by magnetoconvection. Even though the possibility of the p-mode driving has been often considered, the internal excitation has been rarely investigated. We report the observational evidence for the internal excitation obtained by analyzing velocity oscillations in the temperature minimum region of a sunspot umbra. The velocity oscillations in the temperature minimum region were determined from Fe I
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