PLASMA MASER EFFECT IN MAGNETOSPHERE PLASMA ASSOCIATED WITH MHD TURBULENCE

The interaction of an ion acoustic wave with a kinetic Alfven wave is considered through the plasma maser effect. The plasma maser effect as an energy upconversion mode coupling process, is found to be effectiv e in drawing energy from low frequency MHD turbulence in the resonant mode to the non-resonant ion acoustic wave turbulence in the magnetosp here plasma near the Earth's foreshock region. The calculated growth r ate for the ion acoustic wave shows that one of the dominant turbulenc es in the region of the Earth's foreshock is excited as it draws energ y from MHD turbulence through the plasma maser effect. (C) 1997 Publis hed by Elsevier Science Ltd. All rights reserved.