Generation of electromagnetic waves in the very low frequency band by velocity gradient

TitleGeneration of electromagnetic waves in the very low frequency band by velocity gradient
Publication TypeJournal Article
Year of Publication2014
AuthorsGanguli, G, Tejero, E, Crabtree, C, Amatucci, W, Rudakov, L
JournalPhysics of Plasmas
Volume21
Issue1
Pagination012107
Date Published01/2014
ISSN1070-664X
KeywordsElectromagnetic wave
AbstractIt is shown that a magnetized plasma layer with a velocity gradient in the flow perpendicular to the ambient magnetic field is unstable to waves in the Very Low Frequency band that spans the ion and electron gyrofrequencies. The waves are formally electromagnetic. However, depending on wave vector k⎯⎯=kc/ωpe (normalized by the electron skin depth) and the obliqueness, k⊥/k|| , where k⊥,∣∣∣∣ are wave vectors perpendicular and parallel to the magnetic field, the waves are closer to electrostatic in nature when k⎯⎯≫1 and k⊥≫k|| and electromagnetic otherwise. Inhomogeneous transverse flows are generated in plasma that contains a static electric field perpendicular to the magnetic field, a configuration that may naturally arise in the boundary layer between plasmas of different characteristics.
URLhttp://scitation.aip.org/content/aip/journal/pop/21/1/10.1063/1.4862032
DOI10.1063/1.4862032
Short TitlePhys. Plasmas


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