Kinetic Alfven wave in inhomogeneous plasma in presence of general loss-cone distribution function and inhomogeneous electric field: Particle aspect analysis

Dispersion relation, current and growth rate of the kinetic Alfven wave wit h general loss-cone distribution function in a low beta inhomogeneous plasm a in the presence of an inhomogeneous electric field applied perpendicular to the magnetic field have been obtained by investigating the trajectories of the charged particles, The whole plasma is considered to consist of reso nant and non-resonant particles. It is assumed that non-resonant particles support the oscillatory motion of kinetic Alfven wave while the resonant pa rticles participate in the energy exchange with the wave. The effects of st eepness of loss-cone distribution and inhomogeneity of electric field are d iscussed on the dispersion relation, current and growth rate of the instabi lity. The results are interpreted for the space plasma parameters appropria te to the auroral acceleration region of the earth's magnetoplasma.