The generating region of bidirectional electron beams in the corona

	The generating region of bidirectional electron beams in the corona
	Xie RX(谢瑞祥)1,2,3 ; Fu, QJ 1,3; Wang M(汪敏)1,2,3 ; Liu, YY 1,3; Xie, RX
刊名	SOLAR PHYSICS
	2000-12
卷号	197 期号:2 页码:375-385
ISSN号	0038-0938
通讯作者	Xie, RX
产权排序	第二完成单位
英文摘要	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).
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SOLAR-FLARE ; RADIO-EMISSION ; MAGNETIC-FIELD ; X-RAY ; BURSTS ; SPIKES ; ACCELERATION ; PHOENIX
收录类别	SCI
原文出处	http://link.springer.com/article/10.1023%2FA%3A1026541718129
语种	英语
WOS记录号	WOS:000166644500010
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5593]
专题	云南天文台_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
推荐引用方式 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.