Resonant Mode Conversion of Alfvén Waves to Kinetic Alfvén Waves in an Inhomogeneous Plasma

doi:10.3847/1538-4357/ab2bf1

	Resonant Mode Conversion of Alfvén Waves to Kinetic Alfvén Waves in an Inhomogeneous Plasma
	Xiang,L.1,2; Chen,L.1; Wu,D. J.1
刊名	The Astrophysical Journal
	2019-08-13
卷号	881 期号:1
关键词	instabilities Sun: atmosphere waves
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab2bf1
英文摘要	Abstract Kinetic Alfvén waves (KAWs) are dispersive Alfvén waves (AWs) with a perpendicular wavelength comparable to the ion (ion–acoustic) gyroradius or the electron inertial length and can play an important role in wave energy dissipation and particle energization. In this paper, we investigate the resonant mode conversion of AWs into KAWs for the case of an arbitrary angle α between the density gradient of the ambient plasma and the ambient magnetic field in an inhomogeneous two-temperature magnetoplasma. The results show that the mode conversion sensitively depends on the angle α, the density inhomogeneous gradient , and the parallel wavenumber , as well as the ion to electron temperature ratio . In particular, the excited KAWs are stronger when α is closer to 90° and are hardly excited for . Moreover, the maximal strength of the excited KAW increases with the increase of , but decreases with the increase of . Also, the maximal strength of the excited KAW has a larger value at larger for . These results are helpful for our comprehensive understanding of the resonant mode conversion of AWs into KAWs in solar magnetic atmospheres when AWs originating from the photosphere propagate along solar magnetic fields into the corona.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-881-1-AB2BF1
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/27250]
专题	中国科学院紫金山天文台
作者单位	1.Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, 210034, Nanjing, People's Republic of China djwu@pmo.ac.cn 2.University of Science and Technology of China, 230026, Hefei, People's Republic of China
推荐引用方式 GB/T 7714	Xiang,L.,Chen,L.,Wu,D. J.. Resonant Mode Conversion of Alfvén Waves to Kinetic Alfvén Waves in an Inhomogeneous Plasma[J]. The Astrophysical Journal,2019,881(1).
APA	Xiang,L.,Chen,L.,&Wu,D. J..(2019).Resonant Mode Conversion of Alfvén Waves to Kinetic Alfvén Waves in an Inhomogeneous Plasma.The Astrophysical Journal,881(1).
MLA	Xiang,L.,et al."Resonant Mode Conversion of Alfvén Waves to Kinetic Alfvén Waves in an Inhomogeneous Plasma".The Astrophysical Journal 881.1(2019).