Turbulent spectrum of Alfv,n waves excited by a kinetic instability for explaining the modulations with multi-timescales in 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

	Turbulent spectrum of Alfv,n waves excited by a kinetic instability for explaining the modulations with multi-timescales in solar flares
	Huang, Guangli
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2009-05-01
卷号	321 期号:2 页码:79-89
关键词	The Sun: flares The Sun: waves
ISSN号	0004-640X
英文摘要	A low-frequency wave is treated as a local oscillation to modulate the guiding center of electrons beam, which is considered as free energy to excite Alfv,n waves by a kinetic plasma instability under low-frequency approximation. The nonlinearity of the model is shown by a critical value of the amplitude of the low-frequency wave, and Alfv,n waves are growing in a broad turbulent spectrum with fractional harmonics, which strongly depend on the criterion. The instability is limited in the direction nearly perpendicular to the ambient magnetic field. The growth rates are very sensitive to the beam speed that perpendicular to the magnetic field, the propagational angle, and the magnetic field strength, but not sensitive to the beam speed parallel to the magnetic field. This model is used to explain the modulations with multiple timescales in the flare light curves at radio, hard X-ray and H-alpha bands.
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]	FAST MHD WAVES ; HARD X-RAYS ; H-ALPHA ; NUMERICAL SIMULATIONS ; MICROWAVE-BURSTS ; CORONAL PLASMA ; RADIO-EMISSION ; DIRECT AMPLIFICATION ; PULSATIONS ; CATALOG
收录类别	SCI
语种	英语
WOS记录号	WOS:000265440200001
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1547]
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 210008, Peoples R China
推荐引用方式 GB/T 7714	Huang, Guangli. Turbulent spectrum of Alfv,n waves excited by a kinetic instability for explaining the modulations with multi-timescales in solar flares[J]. ASTROPHYSICS AND SPACE SCIENCE,2009,321(2):79-89.
APA	Huang, Guangli.(2009).Turbulent spectrum of Alfv,n waves excited by a kinetic instability for explaining the modulations with multi-timescales in solar flares.ASTROPHYSICS AND SPACE SCIENCE,321(2),79-89.
MLA	Huang, Guangli."Turbulent spectrum of Alfv,n waves excited by a kinetic instability for explaining the modulations with multi-timescales in solar flares".ASTROPHYSICS AND SPACE SCIENCE 321.2(2009):79-89.