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Doppler shift oscillations of a sunspot detected by CYRA and IRIS
Alternative TitleWOS:000586587400001
Li, D.; Yang, X.; Bai, X. Y.; Su, J. T.; Ning, Z. J.; Cao, W.; Deng, Y. Y.
Source PublicationASTRONOMY & ASTROPHYSICS
2020
Volume642Pages:A231
DOI10.1051/0004-6361/202039007
ISSN0004-6361
Language英语
Keywordsunspots Sun: oscillations Sun: infrared Sun: UV radiation line: profiles SOLAR CARBON-MONOXIDE UMBRAL OSCILLATIONS PHOTOELECTRIC OBSERVATIONS PENUMBRAL WAVES HIGH-RESOLUTION 165 BC CO LIGHT MAGNETOCONVECTION SPECTROSCOPY
AbstractContext. The carbon monoxide (CO) molecular line at around 46655 angstrom in solar infrared spectra is often used to investigate the dynamic behavior of the cold heart of the solar atmosphere, i.e., sunspot oscillation, especially at the sunspot umbra.Aims. We investigated sunspot oscillation at Doppler velocities of the CO 7-6 R67 and 3-2 R14 lines that were measured by the Cryogenic Infrared Spectrograph (CYRA), as well as the line profile of MgII k line that was detected by the Interface Region Imaging Spectrograph (IRIS).Methods. A single Gaussian function is applied to each CO line profile to extract the line shift, while the moment analysis method is used for the MgII k line. Then the sunspot oscillation can be found in the time-distance image of Doppler velocities, and the quasi-periodicity at the sunspot umbra are determined from the wavelet power spectrum. Finally, the cross-correlation method is used to analyze the phase relation between different atmospheric levels.Results. At the sunspot umbra, a periodicity of roughly 5 min is detected at the Doppler velocity range of the CO 7-6 R67 line that formed in the photosphere, while a periodicity of around 3 min is discovered at the Doppler velocities of CO 3-2 R14 and MgII k lines that formed in the upper photosphere or the temperature minimum region and the chromosphere. A time delay of about 2 min is measured between the strong CO 3-2 R14 line and the MgII k line.Conclusions. Based on the spectroscopic observations from the CYRA and IRIS, the 3 min sunspot oscillation can be spatially resolved in the Doppler shifts. It may come from the upper photosphere or the temperature minimum region and then propagate to the chromosphere, which might be regarded as a propagating slow magnetoacoustic wave.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7535
Collection中国科学院国家空间科学中心
Affiliation1.[Li, D.
2.Ning, Z. J.] Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210033, Peoples R China
3.[Li, D.
4.Bai, X. Y.
5.Su, J. T.
6.Deng, Y. Y.] Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
7.[Li, D.] Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China
8.[Yang, X.
9.Cao, W.] New Jersey Inst Technol, Big Bear Solar Observ, Big Bear City, CA 92314 USA
10.[Su, J. T.
11.Deng, Y. Y.] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
12.[Yang, X.
13.Cao, W.] New Jersey Inst Technol, Ctr Solar Terr Res, 323 Martin Luther King Blvd, Newark, NJ 07102 USA
Recommended Citation
GB/T 7714
Li, D.,Yang, X.,Bai, X. Y.,et al. Doppler shift oscillations of a sunspot detected by CYRA and IRIS[J]. ASTRONOMY & ASTROPHYSICS,2020,642:A231.
APA Li, D..,Yang, X..,Bai, X. Y..,Su, J. T..,Ning, Z. J..,...&Deng, Y. Y..(2020).Doppler shift oscillations of a sunspot detected by CYRA and IRIS.ASTRONOMY & ASTROPHYSICS,642,A231.
MLA Li, D.,et al."Doppler shift oscillations of a sunspot detected by CYRA and IRIS".ASTRONOMY & ASTROPHYSICS 642(2020):A231.
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