Rotating Alfvén waves in rotating plasmas

Angular momentum coupling between a rotating magnetized plasma and torsional Alfvén waves carrying orbital angular momentum (OAM) is examined. It is demonstrated not only that rotation is the source of Fresnel–Faraday rotation – or orbital Faraday rotation effects – for OAM-carrying Alfvén waves, bu...

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Bibliographic Details
Published in:Journal of plasma physics 2023-12, Vol.89 (6), Article 905890613
Main Authors: Rax, J.-M., Gueroult, R., Fisch, N.J.
Format: Article
Language:English
Subjects:
Angular momentum
Astrophysics
Electrons
Faraday effect
Geophysics
Magnetic fields
Magnetohydrodynamic waves
Plasma
Propagation
Rotating plasmas
Velocity
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Summary:Angular momentum coupling between a rotating magnetized plasma and torsional Alfvén waves carrying orbital angular momentum (OAM) is examined. It is demonstrated not only that rotation is the source of Fresnel–Faraday rotation – or orbital Faraday rotation effects – for OAM-carrying Alfvén waves, but also that angular momentum from an OAM-carrying Alfvén wave can be transferred to a rotating plasma through the inverse process. For the direct process, the transverse structure angular rotation frequency is derived by considering the dispersion relation for modes with opposite OAM content. For the inverse process, the torque exerted on the plasma is derived as a function of wave and plasma parameters.
ISSN:0022-3778
1469-7807
DOI:10.1017/S0022377823001368