期刊
SOLAR PHYSICS
卷 266, 期 1, 页码 5-16出版社
SPRINGER
DOI: 10.1007/s11207-010-9600-x
关键词
Spectral line, intensity and diagnostics; Sunspots, umbra; Velocity fields, photosphere
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Ministry of Education, Science, Sports, Technology, and Culture of Japan [17GS0208]
- Japanese Ministry of Education, Culture, Sports, Science and Technology [19540474]
- JSPS
- Grants-in-Aid for Scientific Research [19540474] Funding Source: KAKEN
We performed two-dimensional spectroscopic observations of the preceding sunspot of NOAA 10905 located off disk center (S8 E36, mu a parts per thousand 0.81) by using the Interferometric BI-dimensional Spectrometer (IBIS) operated at the Dunn Solar Telescope (DST) of the National Solar Observatory, New Mexico. The magnetically insensitive Fe I line at 709.04 nm was scanned in wavelength repetitively at an interval of 37 s to calculate sequences of maps of the line-wing and line-core intensity, and the line-of-sight Doppler velocity at different line depths (3% to 80%). Visual inspection of movies based on speckle reconstructions computed from simultaneous broadband data and the local continuum intensity at 709.04 nm revealed an umbral dot (UD) intruding rapidly from the umbral boundary to the center of the umbra. The apparent motion of this object was particularly fast (1.3 km s(-1)) when compared to typical UDs. The lifetime and size of the UD was 8.7 min and 240 km, respectively. The rapid UD was visible even in the line-core intensity map of Fe I 709.04 nm and was accompanied by a persistent blueshift of about 0.06 km s(-1).
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