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Basics of Parametric Decay Instability in Magnetized Plasma
Version 1
: Received: 26 September 2024 / Approved: 27 September 2024 / Online: 29 September 2024 (11:02:58 CEST)
How to cite: Shesterikov, I. Basics of Parametric Decay Instability in Magnetized Plasma. Preprints 2024, 2024092290. https://doi.org/10.20944/preprints202409.2290.v1 Shesterikov, I. Basics of Parametric Decay Instability in Magnetized Plasma. Preprints 2024, 2024092290. https://doi.org/10.20944/preprints202409.2290.v1
Abstract
Parametric decay instabilities frequently occur in wave interactions. These instabilities typically have thresholds for wave amplitudes. They arise when nonlinearity, such as a spatial pressure inhomogenety, couples different waves. For these instabilities to arise, the waves must satisfy frequency and wavenumber matching conditions, which follow from the laws of energy and momentum conservation. However, parametric instabilities are not limited to wave interactions; the simples form of parametric instability is parametrically coupled oscillators. Magnetized plasma represents a unique wave medium in which numerous waves of various polarizations and spatial-temporal scales are easily excited and weakly damped. The greater the number of wave types, the easier it is to satisfy resonance conditions like the frequency and wavenumber matching conditions, and thus parametrically excite, or "drive" new waves from the initial wave. Therefore, in magnetoactive plasma, all known types of parametric instabilities can arise.
Keywords
Parametric instability; plasma waves; Alfven waves
Subject
Physical Sciences, Fluids and Plasmas Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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