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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
2019-08-13
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume881Issue:1
AbstractAbstract 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.
Keywordinstabilities Sun: atmosphere waves
DOI10.3847/1538-4357/ab2bf1
Language英语
WOS IDIOP:0004-637X-881-1-ab2bf1
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27251
Collection中国科学院紫金山天文台
Affiliation1.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
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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).
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