Kd. Misra et Rs. Pandey, GENERATION OF WHISTLER EMISSIONS BY INJECTION OF HOT-ELECTRONS IN THEPRESENCE OF A PERPENDICULAR AC ELECTRIC-FIELD, J GEO R-S P, 100(A10), 1995, pp. 19405-19411
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.