THE DISPERSION RELATIONS AND INSTABILITY THRESHOLDS OF OBLIQUE PLASMA MODES IN THE PRESENCE OF AN ION BEAM

被引:50
作者
Verscharen, Daniel [1 ]
Chandran, Benjamin D. G. [1 ,2 ]
机构
[1] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA
[2] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA
关键词
magnetohydrodynamics (MHD); solar wind; Sun: corona; turbulence; waves; ELECTROMAGNETIC PROTON/PROTON INSTABILITIES; ALFVEN/ION-CYCLOTRON WAVES; NEGATIVE-ENERGY WAVES; SOLAR-WIND TURBULENCE; ALPHA-PARTICLES; HYBRID SIMULATIONS; ALPHA/PROTON INSTABILITIES; MAGNETOSONIC INSTABILITY; INTERSTELLAR TURBULENCE; HEAVY-IONS;
D O I
10.1088/0004-637X/764/1/88
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
An ion beam can destabilize Alfven/ion-cyclotron waves and magnetosonic/whistler waves if the beam speed is sufficiently large. Numerical solutions of the hot-plasma dispersion relation have previously shown that the minimum beam speed required to excite such instabilities is significantly smaller for oblique modes with k x B-0 not equal 0 than for parallel-propagating modes with k x B-0 = 0, where k is the wavevector and B-0 is the background magnetic field. In this paper, we explain this difference within the framework of quasilinear theory, focusing on low-beta plasmas. We begin by deriving, in the cold-plasma approximation, the dispersion relation and polarization properties of both oblique and parallel-propagating waves in the presence of an ion beam. We then show how the instability thresholds of the different wave branches can be deduced from the wave-particle resonance condition, the conservation of particle energy in the wave frame, the sign (positive or negative) of the wave energy, and the wave polarization. We also provide a graphical description of the different conditions under which Landau resonance and cyclotron resonance destabilize Alfven/ion-cyclotron waves in the presence of an ion beam. We draw upon our results to discuss the types of instabilities that may limit the differential flow of alpha particles in the solar wind.
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页数:12
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