Role of ion-acoustic wave energy in enhanced X-mode radiation phenomena in magnetospheric plasma

Most of the energy in magnetospheric plasma is available in the form of low-frequency turbulence. In this paper, we have explored the possibility of pumping such low-frequency turbulence wave energy into high-frequency X-mode in the magnetosphere. We have considered the wave energy up-conversion pro...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2024, 84(3), , pp.242-249
Main Authors: Saikia, Banashree, Deka, P. N.
Format: Article
Language:English
Subjects:
Acoustic waves
Acoustics
Distribution functions
Energy
Magnetospheres
Mathematical and Computational Physics
Original Paper - Geophysics and Astrophysics
Parameter modification
Particle and Nuclear Physics
Particle interactions
Physics
Physics and Astronomy
Plasma
Theoretical
Turbulence
Upconversion
Wave interaction
Wave power
Wave-particle interactions
물리학
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Summary:Most of the energy in magnetospheric plasma is available in the form of low-frequency turbulence. In this paper, we have explored the possibility of pumping such low-frequency turbulence wave energy into high-frequency X-mode in the magnetosphere. We have considered the wave energy up-conversion process through the nonlinear wave-particle interaction of the ion-acoustic wave and the X-mode wave. In this model of wave energy up-conversion, we have considered a particle distribution of modified Maxwellian with the involvement of a gradient parameter associated with the spatial gradient and temperature gradient of magnetospheric plasma. When considering the Vlasov–Maxwell system of equations to describe the wave interaction process, we have evaluated the fluctuating parts of the particle distribution function due to the ion-acoustic wave field for the modulated field and the nonlinear fluctuating parts of the distribution function due to X-mode. The nonlinear dispersion relation for X-mode enables us to estimate the growth of X-mode at the expense of the ion-acoustic wave energy of the magnetospheric plasma. We have also demonstrated that how this growth process is influenced by gradient parameters associated with this system.
ISSN:0374-4884
1976-8524
DOI:10.1007/s40042-023-00973-w