GENERATION OF WHISTLER EMISSIONS BY INJECTION OF HOT-ELECTRONS IN THEPRESENCE OF A PERPENDICULAR AC ELECTRIC-FIELD

The dispersion for the whistler mode instability in an infinite magnet oplasma in the presence of a perpendicular electric field for a loss c one type distribution function having an anisotropic temperature is ob tained. The method of characteristics solutions using the perturbed an d unperturbed particle trajectories have been used to determine the pe rturbed distribution function. Growth rates for various strengths of t he loss cone index have been determined. The effect of injection of ho t energetic particles of solar wind origin having a positive slope and a loss cone index j = 1 has been evaluated. The ac frequency, rather than its magnitude, affects the growth rate and shifts the maxima to a higher ($) over bar k or frequency range, Modifying the resonance con ditions of charged particles. The injection of a higher number of ener getic hot electrons affects the growth rate significantly, decreasing the maxims by an order of magnitude aad shifting them to a lower frequ ency or ($) over bar k ranges in contrast to cold plasma injection res ults. This result is of importance in explaining the observed VLF emis sions over a wide frequency range.