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Study of Electromagnetic Electron-Cyclotron Waves with Kappa Distribution Function in the Magnetosphere

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The electromagnetic electron cyclotron (EMEC) waves with temperature anisotropy are investigated in the presence of ac electric field perpendicular to the ambient magnetic field for an inhomogeneous magnetosphere. Following the kinetic approach, growth rate of EMEC waves is studied theoretically. By using the method of characteristic solution, the expression for dispersion relation is drawn. The observations made by a space probes, showed that magnetospheric plasma contain more particles in high energy tail. Therefore, in this paper Kappa distribution is employed instead of usual Maxwellian distribution. The study focuses on the parallel as well as the oblique propagation of EMEC waves with variation in temperature anisotropy, magnitude of AC frequency and angle of propagation with respect to magnetic field direction. It is found that these parameters support the growth rate of EMEC waves in the magnetosphere. It is also inferred from the graphs plotted that EMEC wave propagating parallel grows more significantly than in case of oblique propagation. Numerical analysis show the generation of second harmonics followed by occurrence of first harmonics. These results are appropriate for applications to space plasma environments and magnetospheric regimes for detailed comparative planetary study.
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Document Type: Research Article

Publication date: December 1, 2014

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  • Journal of Advanced Physics is an interdisciplinary peer-reviewed journal consolidating research activities in all experimental and theoretical aspects of advanced physics. The journal aims in publishing articles of novel and frontier physics that merit the attention and interest of the whole physics community. JAP publishes review articles, full research articles, short communications of important new scientific and technological findings in all latest research aspects of physics.
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