a1 Laboratoire de Géophysique Externe, CNRS, 4 Avenue de Neptune, 94100 Saint Maur, France
The nonlinear interaction of two HF electromagnetic spherical waves is studied in a homogeneous isotropic plasma. Due to space variations in the k vectors of the mother waves, the interaction is localized. The structure and the amplitude of the generated Langmuir wave are calculated and a possible experiment is discussed.
(Received March 06 1982)