Amplification of energetic electrons driven whistler mode by loss cone induced reflected particles

This introduces asymmetry in plasma and divides LVPD plasma into three plasma regions of Source, EEF and Target plasmas. The configuration develops a belt like structure, rich with energetic electrons and exhibits enhanced turbulence in the source plasma region. The dispersion relation for the growth of the excited mode suggests that the reflected particle density is directly proportional to its growth. Controlled investigations are initiated to see the role of reflected electrons and strength of loss cone on the plasma instability. Variation in EEF magnetic field controls strength of loss cone and variation in filament current controls population of reflected electron density. This paper will present the experimental results on the amplification of the whistler modes under these conditions and will throw some light on conditions under which mode undergoes transformation from electrostatic to electromagnetic nature. (author)