Journal of Emerging Trends in Engineering and Applied Sciences: Research Areas

Article Title: Study of VLF Mode Instability with AC Electric Field for Subtracted Bi-Maxwellian in the Magnetosphere of Uranus
by R.S.Pandey, Rajbir Kaur, S.Kumar and Mukesh Kumar

Abstract:
Whistler mode wave is studied for subtracted bi-Maxwellian plasma in the magnetosphere of Uranus in the presence of perpendicular AC electric field. Using the method of characteristic solutions and kinetic approach the dispersion relation has been derived. The growth rate has been calculated for Uranian Magnetosphere. Calculation of growth rate shows that either a loss-cone or a thermal anisotropy in the hot plasma component of the magnetosphere of Uranus can lead to the generation of incoherent emission of low frequency whistler mode waves. It is seen that the whistler mode instability can be generated even with the lowest value of magnetic field, like, nanotesla, for subtracted bi-maxwellian distribution function. Also the Doppler shifting frequency changes due to increase in AC frequency. It is also concluded that effective parameters for the generation of Whistler mode wave are temperature anisotropy, relativistic factor, amplitude of subtracted distribution and width of the loss-cone distribution function, which are discussed in results and discussion section. The results are of importance in explaining VLF emissions over a wide frequency range and provide diagnostics of plasma parameters in the Uranian magnetosphere. Present studies should be helpful to get better understanding of auroral activity and whistlers in the planetary magnetospheres.

Keywords: whistler mode waves, effect of A.C field, VLF mode in uranian magnetosphere, subtracted bi-maxwellian distribution function, VLF mode instability.

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