Simultaneous observations of second and sub-second time structures in H-alpha, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 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

	Simultaneous observations of second and sub-second time structures in H-alpha, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 flare
	Huang Guangli; Ji Haisheng
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2007-11-01
卷号	312 期号:1-2 页码:127-138
关键词	solar radio optical X-ray flare fluctuations
ISSN号	0004-640X
英文摘要	Second and sub-second structures were simultaneously detected in optical, radio and hard X-ray (HXR) band, respectively by the GanYu Station of Purple Mountain Observatory, Nobeyama Radio Observatory, and RHESSI satellite in the November 1, 2004 flare (Ji et al., in Astrophys. J. 636:L173, 2006), which may be contributed to the energy transport of the continuous heat flux from the hot corona or chromosphere evaporation and of the accelerated electrons. The linear correlations between the amplitudes of these fluctuations and their flare emissions, and those between the cross-correlation coefficients of the fluctuations at two H (alpha) kernels, or two radio frequencies, or two X-ray energies and their flare emissions may support the causal relationship of the flare and these time structures. While, the cross-correlations of the fluctuations at three different bands suggest that the fluctuations are caused by the common thermal or nonthermal processes in the flare. Moreover, some new features of the fluctuations are reported in the flare: (1) The sub-second fluctuations in radio and HXR bands have a same timescale, which is evidently larger than that in H-alpha band. The difference may be explained by the downward movements of nonthermal electrons or the upward motion of chromosphere evaporation. (2) The power-law distributions of the amplitudes of the second and the sub-second structures are obtained at optical, radio and HXR bands with different indices. (3) The peak-to-peak correspondence of Stokes I and V components in the sub-second structures at radio band suggests that they may be resulted from a periodical particle acceleration and particle injection in this event. However, the second structures may be caused by the modulations of Alfven waves with an upward speed of 10(3) km/s.
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-FLARES ; NUMERICAL SIMULATIONS ; CORONAL PLASMA ; ENERGY-DISTRIBUTION ; MAGNETIC-FIELD ; QUIET SUN ; PULSATIONS ; VARIABILITY ; PARAMETERS ; NANOFLARES
收录类别	SCI
语种	英语
WOS记录号	WOS:000250838700017
公开日期	2012-02-05
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2464]
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	Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Huang Guangli,Ji Haisheng. Simultaneous observations of second and sub-second time structures in H-alpha, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 flare[J]. ASTROPHYSICS AND SPACE SCIENCE,2007,312(1-2):127-138.
APA	Huang Guangli,&Ji Haisheng.(2007).Simultaneous observations of second and sub-second time structures in H-alpha, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 flare.ASTROPHYSICS AND SPACE SCIENCE,312(1-2),127-138.
MLA	Huang Guangli,et al."Simultaneous observations of second and sub-second time structures in H-alpha, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 flare".ASTROPHYSICS AND SPACE SCIENCE 312.1-2(2007):127-138.