Low-frequency responses of a plasma to a large amplitude high-frequency wave polarized on the extraordinary mode
Résumé
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, β the ratio of the kinetic to magnetic pressure, α= 1 - V2g/C2A (Vg the velocity of the moving frame, CA the Alfven velocity) and υ= 1 - C2A/c2. Explicit expressions of the low frequency density nS 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 β compared to α and to the value of υ. A few consequences of this model are discussed.
Domaines
Articles anciensOrigine | Accord explicite pour ce dépôt |
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