GENERATION OF WHISTLER MODE WAVES BY INJECTION OF COLD ELECTRON BEAM FOR LOSS-CONE DISTRIBUTION WITH AC ELECTRIC FIELD IN MAGNETO-PLASMA.

Parallel propagating whistler mode waves, in the presence of AC electric field perpendicular to the ambient magnetic field has been studied for magneto-plasma under the effect of beam injection. The dispersion relation and growth rate have been derived and calculations are performed for pitch angle loss cone unperturbed distribution function. The present analysis shows that the growth rate of whistler mode wave has been found to be varying with the values of temperature anisotropy, number density of injected beam and loss cone angle. It is also inferred that even in the absence of temperature anisotropy, there is growth of whistler waves, implying dominant role played by loss-cone angle in generating whistler mode instability.