摘要
In this paper, we study the electromagnetic instability driven by ion beams and plasmainhomogeneity in the plasma sheet boundary layer and for the first time obtain the growthrate spectrum of electromagnetic waves in a broad frequency range (Ω_i<<0.1ω_(LH)?|ω_r|≤Ω_e,Ω_i and Ω_e are respectively the ion and electron cyclotron frequencies, ω_(LH)=(Ω_iΩ_e)^(1/2) is thelower hybrid frequency). The peak of the growth rate spectrum is near |ω_r|≈ω_(LH) and thesecond peak is near |ω_r|?Ω_e. The fundamental characteristics of the growth rate spectrumare in agreement with the satellite observations of the magnetic noise bursts in the magneto-tail.
In this paper, we study the electromagnetic instability driven by ion beams and plasmainhomogeneity in the plasma sheet boundary layer and for the first time obtain the growthrate spectrum of electromagnetic waves in a broad frequency range (Ω<sub>i</sub><<0.1ω<sub>LH</sub>?|ω<sub>r</sub>|≤Ω<sub>e</sub>,Ω<sub>i</sub> and Ω<sub>e</sub> are respectively the ion and electron cyclotron frequencies, ω<sub>LH</sub>=（Ω<sub>i</sub>Ω<sub>e</sub>）<sup>1/2</sup> is thelower hybrid frequency). The peak of the growth rate spectrum is near |ω<sub>r</sub>|≈ω<sub>LH</sub> and thesecond peak is near |ω<sub>r</sub>|?Ω<sub>e</sub>. The fundamental characteristics of the growth rate spectrumare in agreement with the satellite observations of the magnetic noise bursts in the magneto-tail.
基金
Project supported by the National Natural Science Foundation of.China.
