Solar plasma density and spectrum of accelerated particles derived from the 2.223-mev line of a solar flare

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	Solar plasma density and spectrum of accelerated particles derived from the 2.223-mev line of a solar flare
	Troitskaia, E. V.; Gan, W. Q.; Kuzhevskij, B. M.; Miroshnichenko, L. I.
刊名	SOLAR PHYSICS
	2007-05-01
卷号	242 期号:1-2 页码:87-99
关键词	CHROMOSPHERIC FLARE TIME PROFILE NEUTRON MODELS ATMOSPHERE EMISSION RHESSI
ISSN号	0038-0938
英文摘要	The time profile of the neutron capture line of 2.223 MeV for the flare of 16 December 1988 (its third peak) is analyzed. The enhancements of plasma density in the deep photospheric layers of the Sun under the flare region (an effect of density enhancement) have been deduced by the SINP calculation code. These enhancements are studied based on several modified models of the lower chromosphere, photosphere, and convection zone. Additionally, the case has been examined when the neutron source is placed at the top of the photosphere. The energy spectrum of accelerated particles (protons) is shown to evolve with time. Assuming a stochastic mechanism of acceleration and a Bessel function for the spectrum, we find the spectral index alpha T to increase from 0.005 to 0.1 during the decay phase of the burst; i.e., the proton spectrum becomes harder. Density enhancements found in the flare of 16 December 1988 are consistent with our previous results on the density enhancement effects deduced for two other flares, 6 November 1997 and 22 March 1991. It is suggested that density enhancements in the deep layers of the photosphere may be rather common features of powerful solar flares.
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]	CHROMOSPHERIC FLARE ; TIME PROFILE ; NEUTRON ; MODELS ; ATMOSPHERE ; EMISSION ; RHESSI
收录类别	SCI
语种	英语
WOS记录号	WOS:000248137000007
公开日期	2012-02-05
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2396]
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	1.Moscow MV Lomonosov State Univ, D V Skobeltsyn Inst Nucl Phys SINP, Moscow 119992, Russia 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.IZMIRAN, N V Pushkov Inst, Troitsk 142190, Moscow Region, Russia 4.Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
推荐引用方式 GB/T 7714	Troitskaia, E. V.,Gan, W. Q.,Kuzhevskij, B. M.,et al. Solar plasma density and spectrum of accelerated particles derived from the 2.223-mev line of a solar flare[J]. SOLAR PHYSICS,2007,242(1-2):87-99.
APA	Troitskaia, E. V.,Gan, W. Q.,Kuzhevskij, B. M.,&Miroshnichenko, L. I..(2007).Solar plasma density and spectrum of accelerated particles derived from the 2.223-mev line of a solar flare.SOLAR PHYSICS,242(1-2),87-99.
MLA	Troitskaia, E. V.,et al."Solar plasma density and spectrum of accelerated particles derived from the 2.223-mev line of a solar flare".SOLAR PHYSICS 242.1-2(2007):87-99.