Excitation of waves at 2 ?_p,e and back propagating waves at ?_p,e: a parametric study

P. Trávn??ek (1) , P. Hellinger (1) , D. Schriver (2) , M. G. G. T. Taylor (3)

1 IAP - Institute of Atmospheric Physics [Prague]
2 IGPP - Institute of Geophysics and Planetary Physics [Los Angeles]
3 MSSL - Mullard Space Science Laboratory

We present a parametric study of electrostatic waves generated with angular frequencies 2 w_p,e and - w_p,e by an electron beam using a one-dimensional Vlasov code. We consider a background plasma consisting of three components: two electron populations (a background and a beam) and a proton population (with a mass ratio m_p /m_e = 400 and temperatures T_p = T_e = T ). We investigate the influence of different beam parameters on the nonlinear growth rate of waves with angular frequency 2w_p,e and compare the results of the numerical experiments to theoretical predictions. We also examine the presence and excitation of back propagating waves with angular frequency w_p,e. A discussion on the possible generating mechanisms of the different modes observed in these simulations is also presented.

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]; Sciences de la Terre

P. Trávn??ek, P. Hellinger, D. Schriver, M. G. G. T. Taylor. Excitation of waves at 2 ?_p,e and back propagating waves at ?_p,e: a parametric study. Nonlinear Processes in Geophysics, 2003, 10 (4/5), pp.345-349. ⟨hal-00302223⟩