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The effect of upgoing ion beam and temperature anisotropy on the dispersion\udrelation, growth rate, parallel and perpendicular resonant energies, and\udmarginal instability of the electromagnetic ion cyclotron (EMIC) waves, with\udgeneral loss-cone distribution function, in a low β homogeneous\udplasma, is discussed by investigating the trajectories of the charged\udparticles. The whole plasma is considered to consist of resonant and\udnon-resonant particles. The resonant particles participate in an energy\udexchange with the waves, whereas the non-resonant particles support the\udoscillatory motion of the waves. The effects of the steepness of the loss-cone\uddistribution, ion beam velocity, with thermal anisotropy on resonant energy\udtransferred, and the growth rate of the EMIC waves are discussed. It is found\udthat the effect of the upgoing ion beam is to reduce the energy of transversely\udheated ions, whereas the thermal anisotropy acts as a source of free energy\udfor the EMIC waves and enhances the growth rate. It is found that the EMIC\udwave emissions occur by extracting energy of perpendicularly heated ions in\udthe presence of an upflowing ion beam and a steep loss-cone distribution function\udin the anisotropic magnetoplasma. The effect of the steepness of the loss-cone is\udalso to enhance the growth rate of the EMIC waves. The results are interpreted\udfor EMIC emissions in the auroral acceleration region

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis