Positively drifting structures during the 18 March 2003 solar flare

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳活动的多波段观测研究团组

	Positively drifting structures during the 18 March 2003 solar flare
	Ning, Zongjun; Wu, H.; Xu, F.; Meng, X.
刊名	SOLAR PHYSICS
	2007-03-01
卷号	241 期号:1 页码:77-84
关键词	Sun : flares Sun : radio radiation
ISSN号	0038-0938
英文摘要	We analyze the high-frequency drift radio structures observed by the spectrometer at Purple Mountain Observatory (PMO) over the frequency range of 4.5 - 7.5 GHz during the 18 March 2003 solar flare. The drifting structures take place before the soft X-ray maximum, almost at the maximum of hard X-ray flux at 25 - 50 keV. For the first time, the positive drift in this kind of radio structures is detected in such a high frequency range. Their global drifting rate is roughly estimated as 3.6 GHz s(-1). They appear in four groups, lasting in total for less than 6 s, and have a broad bandwidth of more than 2 GHz but a smaller ratio of the bandwidth of the drifting structures to mean frequency than that of the lower frequency range. The lifetime of each individual burst in this event can be derived by using the high temporal resolution of the spectrometer at PMO and has an average value of 36.3 ms. Since the negative drifting structures observed in the 0.6 - 4.5 GHz frequency range were interpreted to be a radio signature of a plasmoid ejected upward ( moving out of the Sun), the present observation may imply that it is possible for a plasmoid to move downward during a solar flare. However, for a confirmation of this suggestion direct radio imaging observation would be needed.
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]	MAGNETIC RECONNECTION ; BURSTS ; SHOCK
收录类别	SCI
语种	英语
WOS记录号	WOS:000245503000008
公开日期	2012-02-05
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2478]
专题	紫金山天文台_太阳活动的多波段观测研究团组
作者单位	Purple Mt Observ, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Ning, Zongjun,Wu, H.,Xu, F.,et al. Positively drifting structures during the 18 March 2003 solar flare[J]. SOLAR PHYSICS,2007,241(1):77-84.
APA	Ning, Zongjun,Wu, H.,Xu, F.,&Meng, X..(2007).Positively drifting structures during the 18 March 2003 solar flare.SOLAR PHYSICS,241(1),77-84.
MLA	Ning, Zongjun,et al."Positively drifting structures during the 18 March 2003 solar flare".SOLAR PHYSICS 241.1(2007):77-84.