PARALLEL ELECTRIC-FIELD-INDUCED INSTABILITY IN THE MAGNETOSPHERIC ION-ELECTRON PLASMA

A complete dispersion relation for a whistler mode wave propagation in an anisotropic warm ion-electron magnetoplasma in the presence of par allel electric field using the dispersion relation for a circularly po larized wave has been derived. The dispersion relation includes the ef fect of anisotropy for the ion and electron velocity distribution func tions. The growth rate of electron-ion cyclotron waves for different p lasma parameters observed at L = 6.6 RE has been computed and the resu lts have been discussed in detail in the light of the observed feature s of VLF emissions and whistlers. The role of the combination of ion-c yclotron and whistler mode electromagnetic wave propagation along the magnetic field in an anisotropic Maxwellian weakly-ionized magnetoplas ma has been studied.