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IMAGING OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN SOLAR FLARE LOOPS WITH SDO/AIA
Su, JT1; Shen YD(申远灯)2; Liu Y(刘煜)2; Liu, Y3; Mao, XJ1,4; Su, JT (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2012-08-20
卷号755期号:2
DOI10.1088/0004-637X/755/2/113
产权排序第2完成单位
收录类别SCI
关键词Sun: Activity Sun: Corona Sun: Flares Sun: Oscillations
摘要Quasi-periodic pulsations (QPPs) of flaring emission with periods from a few seconds to tens of minutes have been widely detected from radio bands to gamma-ray emissions. However, in the past the spatial information of pulsations could not be utilized well due to the instrument limits. We report here imaging observations of the QPPs in three loop sections during a C1.7 flare with periods of P = 24 s-3 minutes by means of the extreme-ultraviolet 171 angstrom channel of the Atmospheric Imaging Assembly (AIA) instrument on board the Solar Dynamics Observatory. We confirm that the QPPs with the shortest period of 24 s were not of an artifact produced by the Nyquist frequency of the AIA 12 s cadence. The QPPs in the three loop sections were interconnected and closely associated with the flare. The detected perturbations propagated along the loops at speeds of 65-200 km s(-1), close to those of acoustic waves in them. The loops were made up of many bright blobs arranged in alternating bright and dark changes in intensity (spatial periodical distribution) with the wavelengths 2.4-5 Mm (as if they were magnetohydrodynamic waves). Furthermore, in the time-distance diagrams, the detected perturbation wavelengths of the QPPs are estimated to be similar to 10 Mm, which evidently do not fit the above ones of the spatial periodic distributions and produce a difference of a factor of 2-4 with them. It is suggested that the short QPPs with periods P < 60 s were possibly sausagemode oscillations and the long QPPs with periods P > 60 s were the higher (e. g., > 2nd) harmonics of slow magnetoacoustic waves.
项目资助者AJFC [10878016, 11073050] ; National Astronomical Observatories, Chinese Academy of Sciences (CAS) ; Key Laboratory of Solar Activity of CAS ; National Basic Research Program of China [2011CB8114001]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
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WOS记录号WOS:000307791400030
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]2011 FEBRUARY 15 ; X-RAY FLARE ; CORONAL LOOPS ; MAGNETOHYDRODYNAMIC OSCILLATIONS ; PROPAGATING WAVES ; RADIO PULSATIONS ; MAGNETIC-FIELD ; X2.2 FLARE ; EMISSION ; EVENT
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被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7179
专题选址与日冕观测组
通讯作者Su, JT (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China.
作者单位1.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
3.W. W. Hansen Experimental Physical Laboratory, Stanford University, Stanford, CA 94305, USA
4.Department of Astronomy, Beijing Normal University, Beijing 100875, China
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Su, JT,Shen YD,Liu Y,et al. IMAGING OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN SOLAR FLARE LOOPS WITH SDO/AIA[J]. ASTROPHYSICAL JOURNAL,2012,755(2).
APA Su, JT,Shen YD,Liu Y,Liu, Y,Mao, XJ,&Su, JT .(2012).IMAGING OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN SOLAR FLARE LOOPS WITH SDO/AIA.ASTROPHYSICAL JOURNAL,755(2).
MLA Su, JT,et al."IMAGING OBSERVATIONS OF QUASI-PERIODIC PULSATIONS IN SOLAR FLARE LOOPS WITH SDO/AIA".ASTROPHYSICAL JOURNAL 755.2(2012).
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