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INVESTIGATING THE CONDITIONS OF THE FORMATION OF A TYPE II RADIO BURST ON 2014 JANUARY 8
Su, W.1,2,3; Cheng, X.1,3; Ding, M. D.1,3; Chen, P. F.1,3; Ning, Z. J.2; Ji, H. S.2
2016-10-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume830Issue:2Pages:12
Corresponding AuthorCheng, X.(xincheng@nju.edu.cn)
AbstractIt is believed that type II radio bursts are generated by shock waves. In order to understand the generation conditions of type II radio bursts, we analyze the physical parameters of a shock front. The type II radio burst we selected was observed by the Siberian Solar Radio Telescope (SSRT) and Learmonth radio station and was associated with a limb coronal mass ejection (CME) occurring on 2014 January 8 observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. The evolution of the CME in the inner corona presents a double-layered structure that propagates outward. We fit the outer layer (OL) of the structure with a partial circle and divide it into seven directions from -45 degrees to 45 degrees with an angular separation of 15 degrees. We measure the OL speed along the seven directions and find that the speed in the direction of -15 degrees with respect to the central direction is the fastest. We use the differential emission measure method to calculate the physical parameters at the OL at the moment when the type II radio burst was initiated, including the temperature (T), emission measure (EM), temperature ratio (T-d/T-u), compression ratio (X), and Alfven Mach number (MA). We compare the quantities X and MA to those obtained from band-splitting in the radio spectrum, and find that this type II radio burst is generated at a small region of the OL that is located at the sector in the 45 degrees direction. The results suggest that the generation of type II radio bursts (shocks) requires larger values of X and MA rather than simply a higher speed of the disturbance.
Keywordshock waves Sun: corona Sun: radio radiation
DOI10.3847/0004-637X/830/2/70
WOS KeywordCORONAL-MASS-EJECTION ; SPATIALLY-RESOLVED OBSERVATIONS ; WHITE-LIGHT OBSERVATIONS ; SOLAR CORONA ; MAGNETIC-FIELD ; DRIVEN SHOCKS ; STREAMER INTERACTION ; EUV IMAGES ; ACCELERATION ; ELECTRONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000400470900001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22830
Collection中国科学院紫金山天文台
Corresponding AuthorCheng, X.
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Su, W.,Cheng, X.,Ding, M. D.,et al. INVESTIGATING THE CONDITIONS OF THE FORMATION OF A TYPE II RADIO BURST ON 2014 JANUARY 8[J]. ASTROPHYSICAL JOURNAL,2016,830(2):12.
APA Su, W.,Cheng, X.,Ding, M. D.,Chen, P. F.,Ning, Z. J.,&Ji, H. S..(2016).INVESTIGATING THE CONDITIONS OF THE FORMATION OF A TYPE II RADIO BURST ON 2014 JANUARY 8.ASTROPHYSICAL JOURNAL,830(2),12.
MLA Su, W.,et al."INVESTIGATING THE CONDITIONS OF THE FORMATION OF A TYPE II RADIO BURST ON 2014 JANUARY 8".ASTROPHYSICAL JOURNAL 830.2(2016):12.
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