期刊
SOLAR PHYSICS
卷 288, 期 1, 页码 73-88出版社
SPRINGER
DOI: 10.1007/s11207-013-0286-8
关键词
Oscillations, solar; Chromosphere, active; Sunspots, penumbra; Sunspots, umbra; Waves, propagation
资金
- National Research Foundation of Korea [2011-0028102]
- National Research Foundation of Korea [2012R1A2A1A03670387] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We study chromospheric oscillations including umbral flashes and running penumbral waves in a sunspot of active region NOAA 11242 using scanning spectroscopy in H alpha and Ca ii 8542 with the Fast Imaging Solar Spectrograph (FISS) at the 1.6 meter New Solar Telescope at the Big Bear Solar Observatory. A bisector method is applied to spectral observations to construct chromospheric Doppler-velocity maps. Temporal-sequence analysis of these shows enhanced high-frequency oscillations inside the sunspot umbra in both lines. Their peak frequency gradually decreases outward from the umbra. The oscillation power is found to be associated with magnetic-field strength and inclination, with different relationships in different frequency bands.
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