LAUSR

Abstract Through a series of papers, scientists have discussed about electron cyclotron waves in magnetospheric plasma of outer planets having AC electric field parallel to ambient magnetic field. In some investigations, scientists have claimed to consider relativistic plasma. We have looked into the work and have found that their claim of relativistic treatment of plasma is not valid. We have further found that the dispersion relation used by them is erroneous and therefore their results are wrong. Further, we have found that for parallel AC electric field, dispersion relation would be too complicated and its solution may not be feasible.