Abstract
Known results on the coupling of upper hybrid waves with linear low-frequency background modulations are generalised to include finite amplitude density and magnetic field modulations. The present results are thus valid beyond the usual cubic nonlinear Schrodinger equation description. Conditions for the existence of envelope solitons are derived. Super- and sub-Alfvenic upper hybrid solitons with their associated density depressions or humps can appear. Special cases are discussed.
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