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Resonant Mode Conversion of Alfven Waves to Kinetic Alfven Waves in an Inhomogeneous Plasma
Xiang, L.1,2; Chen, L.1; Wu, D. J.1
2019-08-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume881Issue:1Pages:7
Corresponding AuthorWu, D. J.(djwu@pmo.ac.cn)
AbstractKinetic Alfven waves (KAWs) are dispersive Alfven 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 alpha 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 alpha, the density inhomogeneous gradient kappa rho(i), and the parallel wavenumber k(z)rho(i), as well as the ion to electron temperature ratio T-i/T-e. In particular, the excited KAWs are stronger when alpha is closer to 90 degrees and are hardly excited for 0 degrees <= alpha < 40 degrees. Moreover, the maximal strength of the excited KAW increases with the increase of k(z)rho(i) but decreases with the increase of kappa rho(i). Also, the maximal strength of the excited KAW has a larger value at larger T-i/T-e for 80 degrees < alpha <= 90 degrees. 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
WOS KeywordAURORAL ELECTRON ACCELERATION ; NONLINEAR-INTERACTION ; HOSE INSTABILITY ; HEAVY-IONS ; ENERGIZATION ; FIELD ; POWER
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000481694500007
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/32216
Collection中国科学院紫金山天文台
Corresponding AuthorWu, D. J.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210034, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Xiang, L.,Chen, L.,Wu, D. J.. Resonant Mode Conversion of Alfven Waves to Kinetic Alfven Waves in an Inhomogeneous Plasma[J]. ASTROPHYSICAL JOURNAL,2019,881(1):7.
APA Xiang, L.,Chen, L.,&Wu, D. J..(2019).Resonant Mode Conversion of Alfven Waves to Kinetic Alfven Waves in an Inhomogeneous Plasma.ASTROPHYSICAL JOURNAL,881(1),7.
MLA Xiang, L.,et al."Resonant Mode Conversion of Alfven Waves to Kinetic Alfven Waves in an Inhomogeneous Plasma".ASTROPHYSICAL JOURNAL 881.1(2019):7.
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