PMO OpenIR  > 太阳活动的多波段观测研究团组
The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere
Xu, FY; Wu, HA
2004-10-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume425Issue:1Pages:281-285
AbstractA rare solar radio V-shaped structure was observed on August 25, 1999 by the 4.5-7.5 GHz spectrograph of the Purple Mountain Observatory, China. It consists of a reverse drift component followed by a normal drift one, which seems to be an unusual frequency drift event because of the jump of reverse drift rate from 3.22 to 1.53 GHz/s and the fastest drift rate of -3.53 GHz/s. According to their different drift rates, the V-shaped structure can be divided into three parts. By the consideration of plasma emission of an electron beam, a three-component solar atmospheric model with large and small scale lengths lambda, lambda(1) and lambda(2) to describe the equilibrium solar atmosphere and local inhomogeneity as well as the energy loss of the electron beam due to electron-electron collision is proposed. The local scale lengths lambda(1) = 5.5 x 10(9), lambda(1) = 7.7 x 10(9) cm and (υ) over bar (1) = 0.41 c, (υ) over bar (2) = 0.25 c at Parts I and 2 of the reverse drift component are obtained. The variations of scale length of lambda(1) < λ(2) and <(upsilon)over bar>(1) > (υ) over bar (2), especially (υ) over bar (1) > (υ) over bar (2), could be responsible for the jump of drift rate. The normal drift rate would be interpreted as the increase of average energy E' of the electron beam at the mirror due to the decrease in electrons of lower energy via energy loss of collision. The three-component solar atmospheric model and the energy loss of the electron beam are discussed.
KeywordSun : Flares Sun : Radio Radiation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361:20040174
WOS KeywordELECTRON-BEAMS ; EMISSION ; BURSTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000224734400033
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7729
Collection太阳活动的多波段观测研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Xu, FY,Wu, HA. The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere[J]. ASTRONOMY & ASTROPHYSICS,2004,425(1):281-285.
APA Xu, FY,&Wu, HA.(2004).The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere.ASTRONOMY & ASTROPHYSICS,425(1),281-285.
MLA Xu, FY,et al."The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere".ASTRONOMY & ASTROPHYSICS 425.1(2004):281-285.
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