Abstract
For the study of propagation of electron cyclotron waves in magnetospheric plasma, besides the two distribution functions: (i) bi-Maxwellian distribution function, and (ii) generalized Lorentzian (kappa) distribution function, subtracted bi-Maxwellian distribution function is also used in some investigations. In all these investigations, temperature anisotropy is considered, besides a distribution function. In the investigations, for the subtracted bi-Maxwellian distribution function, plasma is considered either relativistic or non-relativistic. We have looked into some investigations where subtracted bi-Maxwellian distribution function is used and we have analyzed them. We have also considered AC electric field perpendicular to the magnetic field in the magnetospheric plasma, and have found that their claim of relativistic treatment of plasma is not valid. Further, we have found that the dispersion relation used for propagation of waves parallel to the magnetic field is erroneous. Further, the dispersion relation for oblique propagation of waves also is erroneous. Therefore, the results of those investigations are wrong. We have also found that for the same set of input parameters, different results are found, though all of them are wrong.
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