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electromagnetic radiation and nonlinear energy flow in an electron beam-plasma systemIt is shown that the unstable electron-plasma waves of a beam-plasma system can generate electromagnetic radiation in a uniform plasma. The generation mechanism is a scattering of the unstable electron plasma waves off ion-acoustic waves, producing electromagnetic waves whose frequency is near the local plasma frequency. The wave vector and frequency matching conditions of the three-wave mode coupling are experimentally verified. The electromagnetic radiation is observed to be polarized with the electric field parallel to the beam direction, and its source region is shown to be localized to the unstable plasma wave region. The frequency spectrum shows negligible intensity near the second harmonic of the plasma frequency. These results suggest that the observed electromagnetic radiation of type III solar bursts may be generated near the local plasma frequency and observed downstream where the wave frequency is near the harmonic of the plasma frequency.
Document ID
19850046914
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Whelan, D. A.
(California, University Los Angeles; Northrop Corp., Advanced Systems Div., Pico Rivera, CA, United States)
Stenzel, R. L.
(California, University Los Angeles, CA, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Publication Information
Publication: Physics of Fluids
Volume: 28
ISSN: 0031-9171
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-180
CONTRACT_GRANT: NSF PHY-82-09524
CONTRACT_GRANT: NSF ATM-81-19717
Distribution Limits
Public
Copyright
Other