Stimulated Amplification of VLF and ULF Waves in the Magnetosphere by Localized Injections of Plasma Clouds and Particle Beams

Abstract

Abstract : The cyclotron resonance interaction between ULF-VLF waves and trapped particles may be strongly enhanced in the magnetosphere by the injection of either cold plasma or energetic particle beams. A variety of natural conditions and injections are investigated numerically using the linear theory. Both satellite and rocket injection of cold plasma provide significant enhancements of amplification. Conventional hot electron beams may also amplify narrow frequency bands, if the beam geometry can be effectively altered at injection. Heavy ion beams appear to offer attractive propagation conditions as well as stimulate amplification.