Rok 2024

• Resonant and nonresonant excitation of waves in a planar magnetosonic flow

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2024

  Forced propagation of perturbations in a magnetosonic wave are considered. The driving force may be caused by stimulated Mandelstam–Brillouin scattering of optic waves or by intense magnetosonic exciter. Some heating-cooling function which takes into account radiative cooling and unspecified heating is taken into consideration, as well as nonlinearity of a medium. Both these factors make the excitation particular. The analytical...

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• Unusual dynamics and nonlinear thermal self-focusing of initially focused magnetoacoustic beams in a plasma

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2024

  Unusual thermal self-focusing of two-dimensional beams in plasma which axis is parallel to the equilibrium straight magnetic field is considered. The equi- librium parameters of plasma determine scenario of a beam divergence (usual or unusual) which is stronger as compared with a flow without magnetic field. Nonlinear thermal self-action of a magnetosonic beam behaves differently in the ordinary and unusual cases. Damping of wave...

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Rok 2023

• About definition of modes and magnetosonic heating in a plasma’s flow: Especial cases of perpendicular and nearly perpendicular wave vector and magnetic field

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2023

  Dynamics of hydrodynamic perturbations in a plasma depend strongly on an angle between the wave vector and equilibrium straight magnetic field. The case of perpendicular propagation is especial. There are only two (fast) magnetosonic modes since two (slow) ones degenerate into the stationary one with zero speed of propagation. This demands individual definition of wave modes by the links of hydrodynamic relations. These links are...

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Rok 2022

• Relations between magnetosonic perturbations as an indicator of a magnetosonic exciter and equilibrium parameters of a plasma

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2022

  The thermodynamic relations between perturbation of pressure and pertur- bation of mass density and between components of velocity which specify a magnetosonic wave are theoretically studied. A planar flow with the wave vec- tor forming a constant angle with the equilibrium magnetic field is investigated. The theory considers deviation from the adiabaticity of a flow due to some kind of heating–cooling function and thermal conduction...

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Rok 2021

• The description of non-linear interactions of wave and non-wave modes in a non-adiabatic plasma flow

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2021

  The method of derivation of non-linear equations for interacting modes is explained and applied to a plasma's flow affected by a magnetic field. It is based on the linear projecting of the total perturbation field into specific variations of variables in individual modes of a flow. The method may be applied in many examples of fluid flows with different mechanisms of non-adiabaticity. It is of special importance in complex flows...

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