Anomalous absorption of microwave radiation by a plasma in the electron cyclotron band

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:5501285

Kovalev, V F; Romanov, A B

We study the anomalous absorption of radiation which is connected with the parametric excitation of high-frequency upper-hybrid and low-frequency ion-sound or lower-hybrid oscillations and which occurs when we pump with a slow extraordinary electromagnetic wave which propagates across a magnetic field in a plasma. We show that when the wavelength of the pump field is less than some minimum value in the region near the threshold ''red'' and ''blue'' pump wave satellites are excited under weak coupling conditions. When the pump field frequency lies between the electron cyclotron frequency and twice its value, the upper hybrid oscillations excited in a rarefied plasma have an anomalous dispersion which leads to an energy transfer to excitations with a shorter wavelength in the case of a cascade mechanism for the saturation of the parametric instability. In that case the intensity of the blue satellite in the high-frequency turbulence spectrum excited under resonance conditions turns out to be of the same order of magnitude as the intensity of the Stokes line; this agrees qualitatively with the experimentally observed results.

• Research Organization: Moscow Institute for Radio Engineering, Electronics and Automation
• OSTI ID: 5501285
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 50:3; ISSN SPHJA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ABSORPTION
ELECTROMAGNETIC RADIATION
MICROWAVE RADIATION
PLASMA
RADIATIONS
TURBULENCE
WAVE PROPAGATION
WAVELENGTHS