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Dispersion and damping rate of Langmuir wave in space plasma with regularized Kappa distributed electrons

plasma Science and Technology 2022年第1期24卷 47-52页

作者： Yong LIU Xu CHEN School of Sciences Nantong UniversityNantong 226019People's Republic of China Xinglin College Nantong UniversityNantong 226019People’s Republic of China

The dispersion of Langmuir wave(LW)in an unmagnetized collisionless plasma with regularized Kappa distributed electrons is investigated from the kinetic *** frequency and damping rate of LW are analyzed for the parameters relating to the source region of a typeⅢsolar radio *** is found that the linear behavior of LW is greatly modified by the suprathermal indexκand the exponential cutoff parameterα.In the regionκ<1.5,the damping rate of LW will be much larger than the one with Maxwellian distributed ***,the nonlinear process of LW in lowκregion may exhibit different properties in comparison with the one in largeκregion.

关键词： Langmuir wave Kappa distribution damping rate exponential cutoff space plasma

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Effects of heavy ions on kinetic Alfven waves

引用

Communications in Theoretical Physics 2005年第2期43卷 325-332页

作者： YANGLei WUDe-Jin PurpleMountainObservatory theChineseAcademyofSciencesNanjing210008China／／GraduateSchooloftheChineseAcademyofSciencesBeijing100039China PurpleMountainObservatory theChineseAcademyofSciencesNanjing210008China／／NationalAstronomicalObservatoriestheChineseAcademyofSciencesBeijing100012China

Kinetic Alfven Wave (KAW) is one of the low-frequency electromagnetic fluctuations that are identified extensively in space plasmas by in situ observations of satellites and has been an interesting topic for discussion widely in the fields of laboratory, space, and astrophysical plasmas because of its potential importance in plasma particle energization. Some satellite observations show that the number density ratio of the oxygen ions to the ambient plasma is 30% similar to 50%, sometimes, even as high as 80%. In this paper, effects of heavy ion species on KAWs are studied in a low-beta plasma. The results show that heavy ions not only considerably reduce the propagation speed of KAWs, but also remarkably influence the parallel component of perturbed electric field of KAWs (to the ambient magnetic field). The ratio of parallel to perpendicular components of perturbed field decreases (or increases) with the heavy ion abundance for KAWs dominated by the electron inertial length (or by ion acoustic gyroradius). In particular, the resonant condition of KAWs with thermal electrons is modified by the heavy ion species.

关键词： space plasma heavy ions kinetic Alfven wave dispersion relation

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