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The generating region of bidirectional electron beams in the corona
Xie RX(谢瑞祥)1,2,3; Fu, QJ1,3; Wang M(汪敏)1,2,3; Liu, YY1,3; Xie, RX
Source PublicationSOLAR PHYSICS
2000-12
Volume197Issue:2Pages:375-385
DOI10.1023/A:1026541718129
Contribution Rank第2完成单位
Indexed BySCI
AbstractMetric and decimetric type III bursts and microwave spike emissions with negative and positive frequency drift rates which were observed with radio spectrometers at Yunnan and Beijing Observatories are presented. The frequencies and heights at which the bidirectional electron beams originated are estimated. Three events reveal a separatrix frequency (at 250, 1300, and 2900 MHz) between normal- and reverse-drifting radio bursts, indicating a compact acceleration source where electron beams are injected in both upward and downward directions. These cases may indicate that the changeover frequencies of bidirectional electron beams are within a large band from 250 to 2900 MHz and the frequency bands of separatrices are in very small (4 to 100 MHz) and different bands. These type III bursts appear to be a plasma emission phenomenon from a beam of electrons which seem to have widely separated acceleration regions from the high to the low corona. These cases suggest that current sheets that separate open and closed magnetic fluxes in the low corona, and oppositely directed open field lines in the high corona are possible sites for bidirectional electron acceleration. The regions of magnetic topology from closed to open magnetic field structures should be very large (from about 20 000 to 107 000 km above the photosphere).
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0038-0938
URL查看原文
Archive Date2001-03-08
WOS IDWOS:000166644500010
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-FLARE ; RADIO-EMISSION ; MAGNETIC-FIELD ; X-RAY ; BURSTS ; SPIKES ; ACCELERATION ; PHOENIX
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5593
Collection射电天文研究组
Corresponding AuthorXie, RX
Affiliation1.Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing, 100012, China
2.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011, China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xie RX,Fu, QJ,Wang M,et al. The generating region of bidirectional electron beams in the corona[J]. SOLAR PHYSICS,2000,197(2):375-385.
APA Xie RX,Fu, QJ,Wang M,Liu, YY,&Xie, RX.(2000).The generating region of bidirectional electron beams in the corona.SOLAR PHYSICS,197(2),375-385.
MLA Xie RX,et al."The generating region of bidirectional electron beams in the corona".SOLAR PHYSICS 197.2(2000):375-385.
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