RHESSI observations of the Neupert effect in three solar flares

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

	RHESSI observations of the Neupert effect in three solar flares
	Ning, Zongjun
刊名	SOLAR PHYSICS
	2008-03-01
卷号	248 期号:1 页码:99-111
关键词	flares hard X-rays
ISSN号	0038-0938
英文摘要	Previous observations show that in many solar flares there is a causal correlation between the hard X-ray flux and the derivative of the soft X-ray flux. This so-called Neupert effect is indicative of a strong link between the primary energy release to accelerate particles and plasma heating. It suggests a flare model in which the hard X-rays are electron-ion bremsstrahlung produced by energetic electrons as they lose their energy in the lower corona and chromosphere and the soft X-rays are thermal bremsstrahlung from the "chromospheric evaporation" plasma heated by those same electrons. Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observes in a broad energy band and its high spectral resolution and coverage of the low-energy range allow us to separate the thermal continuum from the nonthermal component, which gives us an opportunity to investigate the Neupert effect. In this paper, we use the parameters derived from RHESSI observations to trace the primary energy release and the plasma response: The hard X-ray flux or spectral hardness is compared with the derivative of plasma thermal energy in three impulsive flares on 10 November 2002 and on 3 and 25 August 2005. High correlations show that the Neupert effect does hold for the two hard X-ray peaks of the 10 November 2002 flare, for the first peaks of the 3 August 2005 flare, and for the beginning period of the 25 August 2005 flare.
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]	HARD X-RAY ; CHROMOSPHERIC EVAPORATION ; NONTHERMAL ELECTRONS ; TOTAL-ENERGY ; EMISSION ; BURSTS ; ACCELERATION ; SPECTROMETER ; TEMPERATURE ; MICROWAVE
收录类别	SCI
语种	英语
WOS记录号	WOS:000254441300007
公开日期	2011-12-30
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2033]
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. RHESSI observations of the Neupert effect in three solar flares[J]. SOLAR PHYSICS,2008,248(1):99-111.
APA	Ning, Zongjun.(2008).RHESSI observations of the Neupert effect in three solar flares.SOLAR PHYSICS,248(1),99-111.
MLA	Ning, Zongjun."RHESSI observations of the Neupert effect in three solar flares".SOLAR PHYSICS 248.1(2008):99-111.