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kinetic alfven waves Excited by Cometary Newborn Ions with Large Perpendicular Energies

Plasma Science and Technology 2011年第2期13卷 135-139页

作者： George SAMUEL Devi E SAVITHRI Venugopal CHANDU School of Pure and Applied Physics Mahatma Gandhi University

Stability of the kinetic alfven wave in a plasma of hydrogen, oxygen and electrons is studied. Each species is modeled by drifting ring distributions in the direction parallel to the magnetic field, while in the perpendicular direction the distribution is simulated with a loss cone type distribution obtained through the subtraction of two Maxwellian distributions with different temperatures. It is found that for frequencies ω＊〈 ωcH with ω＊ and ωcH the Doppler shifted and hydrogen ion gyro-frequencies, respectively, the growth rate of the kinetic alfven wave increases with the increase in propagation angles and density of oxygen ions. On the other hand, for frequencies ω＊〈 ωco with ωco the oxygen ion gyro-frequency the growth rate is independent of the oxygen ion density.

关键词： kinetic alfven wave stability multi-ion cometary 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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