Low-frequency responses of a plasma to a large amplitude high-frequency wave polarized on the extraordinary mode

S. Heuraux; G. Leclert; Y. Hadjoudj

doi:doi:10.1051/jp3:1994168

Numéro		J. Phys. III France Volume 4, Numéro 4, April 1994


Page(s)		839 - 848
DOI		https://doi.org/10.1051/jp3:1994168

DOI: 10.1051/jp3:1994168
J. Phys. III France 4 (1994) 839-848

Low-frequency responses of a plasma to a large amplitude high-frequency wave polarized on the extraordinary mode

S. Heuraux, G. Leclert and Y. Hadjoudj

Laboratoire de Physique des Milieux Ionisés, Unité de Recherche Associée au CNRS 835, Faculté des Sciences, Université de Nancy 1, B.P. 239, 54506 Vandoeuvre Cedex, France

(Received 6 July 1993, revised 7 January 1994, accepted 18 January 1994)

Abstract
An exhaustive classification of the density perturbations and magnetic field generation induced by a large amplitude HF wave is made in the steady state case in a moving frame associated to the HF wave packet in the case of one-dimensional spatial variation of the envelope of the HF electric field and the condition of the quasi-neutrality is also specified in this case. The classification depends on four parameters, the skin depth L₀, $\beta$ the ratio of the kinetic to magnetic pressure, $\alpha = 1 - V^2_{\rm g}/C^2_{\rm A}$ ( $V_{\rm g}$ the velocity of the moving frame, $C_{\rm A}$ the Alfven velocity) and $\upsilon = 1 - C^2_{\rm A}/c^2$ . Explicit expressions of the low frequency density $n^{\rm S}$ and induced magnetic field ${\bf B}^{\rm S}$ are given according to the value of L₀ compared to al $\partial_x^{-1}$ , the slow space scale of the perturbations, to the value of $\beta$ compared to $\alpha$ and to the value of $\upsilon$ . A few consequences of this model are discussed.