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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
发表期刊SOLAR PHYSICS
2000-12
卷号197期号:2页码:375-385
DOI10.1023/A:1026541718129
产权排序第2完成单位
收录类别SCI
摘要Metric 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).
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0038-0938
URL查看原文
归档日期2001-03-08
WOS记录号WOS:000166644500010
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-FLARE ; RADIO-EMISSION ; MAGNETIC-FIELD ; X-RAY ; BURSTS ; SPIKES ; ACCELERATION ; PHOENIX
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被引频次:12[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/114a53/5593
专题射电天文研究组
通讯作者Xie, RX
作者单位1.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
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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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