Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳高能及相关物理过程研究团组

	Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect
	Li, You-Ping; Gan, Wei-Qun; Su, Yang
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2009-10-01
卷号	9 期号:10 页码:1155-1164
关键词	Sun: flares Sun: X-rays, gamma-rays
ISSN号	1674-4527
英文摘要	Among the RHESSI flare samples, we concentrated on a kind of flare that presents two successive peaks (that is, it presents both an impulsive phase and a gradual phase) in 12 - 25 keV light curves. Taking the CIA flare on 2002 August 12 as an example, we studied the light curves, spectra, and images in detail. Making full use of the capabilities of RHESSI, we showed some evidence to support the expected causal relationship between these two peaks: the first peak is mainly nonthermal, while the second peak is mainly thermal; the energy carried by nonthermal electrons during the first peak seems to be comparable to the thermal energy of the second peak. The morphologies of X-ray images and their evolutions provide additional evidence for this causality. We conclude that two such peaks in the 12 - 25 keV light curve are good evidence for the chromospheric evaporation. However, the maximum time of the second peak is later than the end time of the first peak, suggesting that for some events, a modification of the traditional Neupert effect could be necessary by inclusion of a time delay, which might be partly related to the filling of the loop by evaporated material.
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 ; NONTHERMAL ELECTRONS ; IMPULSIVE PHASE ; TOTAL-ENERGY ; LOOP ; DISTRIBUTIONS ; ENERGETICS ; SPECTRA ; EVENTS ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000271266300007
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1509]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Li, You-Ping,Gan, Wei-Qun,Su, Yang. Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(10):1155-1164.
APA	Li, You-Ping,Gan, Wei-Qun,&Su, Yang.(2009).Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(10),1155-1164.
MLA	Li, You-Ping,et al."Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.10(2009):1155-1164.