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Nonlinear interaction of minor heavy ions with kinetic Alfven waves and their anisotropic energization in coronal holes
Wu, D. J.; Yang, L.
2007-04-20
Source PublicationASTROPHYSICAL JOURNAL
Volume659Issue:2Pages:1693-1701
AbstractSome recent observations of the solar corona suggest that minor heavy ions undergo an anisotropic and mass-charge dependent energization in the extended corona. In this paper we investigate the nonlinear interaction of minor heavy ions with kinetic Alfven waves (KAWs) in the extended corona where plasma is low-beta, in particular the ion energization by KAWs. We find that the cross-field ion energization depends on the ion mass and charge in the sense that the velocity is proportional to the ion mass-charge ratio and the field-aligned ion energy is directly proportional to the ion charge. Consequently, the effective ion temperature becomes strongly anisotropic, as well as much higher than that of protons. With an empirical model of plasma parameters in a coronal hole and an assumption of anisotropic spectrum for KAWs, we calculate the variations of the ion temperature anisotropy (delta(i) T-i perpendicular to(eff)/T-i parallel to(eff)) and the ion-proton temperature ratio (gamma(i) T-i perpendicular to(eff)/T-p perpendicular to(eff)) with heliocentric distance. The results show that they both increase rapidly with heliocentric distances of 1.5-3.5 R-circle dot. In the lower corona below 1.3 R-circle dot, one has delta(i) and gamma(i) similar or equal to 1, and in the higher corona above 4 R-circle dot, they approach the saturation values delta(i) similar or equal to 0.5A(i)(3) and gamma(i) similar or equal to 0.9A(i)(3)Z(i), where A(i) is the ion mass-charge ratio in units of the proton mass-charge ratio m(p)/e, and Z(i) is the ion charge in units of the elementary charge e. We suggest that not only can the KAW-based model of the anisotropic and mass-charge dependent energization reasonably explain the recent observations of minor heavy ions in polar coronal holes, but KAWs may also be potentially important for understanding the microphysics of the wave-particle interaction in the extended solar corona, where the coronal plasma is heated and accelerated into the solar wind.
KeywordAcceleration Of Particles Plasmas Sun : Corona Waves
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordSOLAR-WIND MODEL ; MAGNETOHYDRODYNAMIC TURBULENCE ; POLAR PLUME ; ACCELERATION ; CYCLOTRON ; PLASMA ; DENSITY ; DRIVEN ; SIMULATIONS ; DISSIPATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000245774700064
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15848
Collection太阳和太阳系等离子体研究团组
AffiliationChinese Acad Sci, Purple Mtn Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Wu, D. J.,Yang, L.. Nonlinear interaction of minor heavy ions with kinetic Alfven waves and their anisotropic energization in coronal holes[J]. ASTROPHYSICAL JOURNAL,2007,659(2):1693-1701.
APA Wu, D. J.,&Yang, L..(2007).Nonlinear interaction of minor heavy ions with kinetic Alfven waves and their anisotropic energization in coronal holes.ASTROPHYSICAL JOURNAL,659(2),1693-1701.
MLA Wu, D. J.,et al."Nonlinear interaction of minor heavy ions with kinetic Alfven waves and their anisotropic energization in coronal holes".ASTROPHYSICAL JOURNAL 659.2(2007):1693-1701.
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