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EXTREME-ULTRAVIOLET MULTI-WAVELENGTH OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN A SOLAR POST-FLARE CUSP-SHAPE LOOP WITH SDO/AIA
Su, JT1; Shen YD(申远灯)2; Liu Y(刘煜)2; Su, JT (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2012-07-20
Volume754Issue:1
DOI10.1088/0004-637X/754/1/43
Contribution Rank第2完成单位
Indexed BySCI
KeywordSun: Activity Sun: Corona Sun: Flares Sun: Oscillations
AbstractWe present extreme-ultraviolet multi-wavelength observations with the SDO/AIA instruments of quasi-periodic pulsations (QPPs) propagating along a cusp-shaped loop formed after an M2.2 flare on the Sun. Our motivation is to detect whether there were slow-mode magnetoacoustic waves propagating along its protruding flux tube. To this end, with fast Fourier transform we extract the short (<3 minutes) and long (>3 minutes) period components of the QPPs from time-space diagrams of the tube slices. We find that velocity differences did exist among the short/long-period components of different wavelengths, but only one event in the long-period ones showed they were greater than the measurement errors (e.g., 65 km s(-1)), which were 330 km s(-1) detected in 171 angstrom, 590 km s(-1) in 211 angstrom, and 180 km s(-1) in 304 angstrom. The intensity modulation in all wavelengths is found to be very large, e. g., similar to 60% of the emission trend for an event in the 171 angstrom passband, which would be an order of magnitude higher than the perturbation of the plasma density in the slow-mode magnetoacoustic waves. Moreover, only the QPPs with upward velocities of 50-300 km s(-1) are found in the tube, and the downward ones of several tens of kilometers are never unambiguously detected. Therefore, most of the QPP events under study were likely the episodic outflows along the tube, and the one with a supersonic speed of 590 km s(-1) may be a kink wave.
Funding OrganizationAJFC [10878016, 11073050] ; National Astronomical Observatories, the Chinese Academy of Sciences (CAS) ; Key Laboratory of Solar Activity of CAS ; National Basic Research Program of China [2011CB8114001]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
WOS IDWOS:000306111800043
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSLOW MAGNETOACOUSTIC WAVES ; CORONAL LOOPS ; PROPAGATING WAVES ; OSCILLATIONS ; PLUMES ; SIGNATURE ; OUTFLOWS ; UPFLOWS ; MODES ; HOLES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7182
Collection选址与日冕观测组
Corresponding AuthorSu, JT (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China.
Affiliation1.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China
2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
Recommended Citation
GB/T 7714
Su, JT,Shen YD,Liu Y,et al. EXTREME-ULTRAVIOLET MULTI-WAVELENGTH OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN A SOLAR POST-FLARE CUSP-SHAPE LOOP WITH SDO/AIA[J]. ASTROPHYSICAL JOURNAL,2012,754(1).
APA Su, JT,Shen YD,Liu Y,&Su, JT .(2012).EXTREME-ULTRAVIOLET MULTI-WAVELENGTH OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN A SOLAR POST-FLARE CUSP-SHAPE LOOP WITH SDO/AIA.ASTROPHYSICAL JOURNAL,754(1).
MLA Su, JT,et al."EXTREME-ULTRAVIOLET MULTI-WAVELENGTH OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN A SOLAR POST-FLARE CUSP-SHAPE LOOP WITH SDO/AIA".ASTROPHYSICAL JOURNAL 754.1(2012).
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