Emission and absorption of Langmuir waves by anisotropic unmagnetized particles.

摘要: The emission and absorption coefficients for Langmuir waves due to anisotropic unmagnetized particles are reduced two complementary forms: one involving integrals over momentum p pitch angle ex; the other an integral a sum Legendre polynomials. quasilinear diffusion former. It is also shown how coefficient may be forms neither derivative nor ex derivative. evaluated explicitly five idealized distributions, called 'forwardcone' anisotropy, 'semi-cos2 ex' loss-cone P, anisotropy P2 respectively. All except can lead growth of waves, but only if distribution function increasing at resonant phase speed, e.g. gap distributions. results have important implications in connection with theory solar radio bursts.