首页|Nonlinear Coupling of Kinetic Alfvén Waves and Ion Acoustic Waves in the Inner Heliosphere
Nonlinear Coupling of Kinetic Alfvén Waves and Ion Acoustic Waves in the Inner Heliosphere
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We study the nonlinear coupling of kinetic Alfvén waves with ion acoustic waves applicable to the Earth's radiation belt and near-Sun streamer belt solar wind using dynamical equations in the form of modified Zakharov systems.Numerical simulations show the formation of magnetic field filamentary structures associated with density humps and dips which become turbulent at later times,redistributing the energy to higher wavenumbers.The magnetic power spectra exhibit an inertial range Kolmogorov-like spectral index value of-5/3 for k⊥ρi<1,followed by a steeper dissipation range spectra with indices∼-3 for the radiation belt case and∼-4 for the near-Sun streamer belt solar wind case,here k⊥ and ρi represent the wavevector component perpendicular to the background magnetic field and the ion thermal gyroradius,respectively.Applying quasilinear theory in terms of the Fokker-Planck equation in the region of wavenumber turbulent spectra,we find the particle distribution function flattening in the superthermal tail population which is the signature of particle energization and plasma heating.
Sunchromosphere-Suncorona-Sunheliosphere
Mani K Chettri、Vivek Shrivastav、Rupak Mukherjee、Nidhi Gaur、R.P.Sharma、Hemam D.Singh
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Department of Physics,Sikkim University,Gangtok,Sikkim,India
DAV Public School,Sector 14,Gurugram,Haryana,India
Plasma Simulation Laboratory,Department of Energy Science and Engineering,Indian Institute of Technology Delhi,Delhi,India
Sikkim University for providing the centralized High Performance Computational facility at the Brahmagupta Lab
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