Statistical analysis of decimetric type III bursts

doi:10.1007/s11207-006-0086-5

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	Statistical analysis of decimetric type III bursts
	Ma Y(马媛); Xie RX(谢瑞祥); Wang M(汪敏); Ma, Y (reprint author), CAS, Natl Astron Observ, Yunnan Observ, Yunnan, Peoples R China.
发表期刊	SOLAR PHYSICS
	2006-10
卷号	238 期号:1 页码:105-115
DOI	10.1007/s11207-006-0086-5
产权排序	第1完成单位
收录类别	SCI
摘要	Detailed statistics and analysis of 264 type III bursts observed with the 625-1500 MHz spectrograph during the 23rd solar cycle (from July 2000 to April 2003) are carried out in the present article. The main statistical results are similar to those of microwave type III bursts presented in the literature cited, such as the correlation between type III bursts and flares, polarization, duration, frequency drift rate (normal and reverse slopes), distribution of type III bursts and frequency bandwidth. At the same time, the statistical results also point out that the average values of the frequency drift rates and degrees of polarization increase with the increase in frequency and the average value of duration decreases with the increase in frequency. Other statistical results show that the starting frequencies of the type III bursts are mainly within the range from 650 to 800 MHz, and most type III bursts have an average bandwidth of 289 MHz. The distributions imply that the electron acceleration and the place of energy release are within a limited decimetric range. The characteristics of the narrow bandwidth possibly involve the magnetic configuration at decimetric wavelengths, the location of electron acceleration in the magnetic field nearto the main flare, the relevant runaway or trapped electrons, or the coherent radio emission produced by some secondary shock waves. In addition, the number of type III bursts with positive frequency drift rates is almost equal to that with negative frequency drift rates. This is probably explained by the hypothesis that an equal number of electron beams are accelerated upwards and downwards within the range of 625 to 1500 MHz. The radiation mechanism of type III bursts at decimetric wavelengths probably includes these microwave and metric mechanisms and the most likely cause of the coherent plasma radiation are the emission processes of the electron cyclotron maser.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0038-0938
URL	查看原文
归档日期	2006-11-14
WOS记录号	WOS:000241456200008
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	RADIO-EMISSION ; SOLAR-FLARES ; FREQUENCY ; CATALOG
引用统计	被引频次：4[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/114a53/6087
专题	太阳物理研究组
通讯作者	Ma, Y (reprint author), CAS, Natl Astron Observ, Yunnan Observ, Yunnan, Peoples R China.
作者单位	National Astronomical Observatories/Yunnan Observatory, CAS, Yunnan, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Ma Y,Xie RX,Wang M,et al. Statistical analysis of decimetric type III bursts[J]. SOLAR PHYSICS,2006,238(1):105-115.
APA	Ma Y,Xie RX,Wang M,&Ma, Y .(2006).Statistical analysis of decimetric type III bursts.SOLAR PHYSICS,238(1),105-115.
MLA	Ma Y,et al."Statistical analysis of decimetric type III bursts".SOLAR PHYSICS 238.1(2006):105-115.

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