Abstract
It is shown, using weak turbulence theory, that Langmuir waves are stabilized by a nonresonant quasilinear scattering of Langmuir waves by ion-sound waves in the presence of a background of developing ion-sound turbulence. This effect, which prevents the conversion of ion-sound turbulence into Langmuir turbulence in this transient regime, was ignored in previous theories. The destabilizing effect of the so-called ‘‘induced bremmsstrahlung’’ of Langmuir waves as proposed by Nambu is furthermore shown to vanish exactly. The need for a renormalized theory in the case of steady-state ion-sound turbulence is discussed.
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