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Radiation from long pulse train electron beams in space plasmasA previous study of electromagnetic radiation from a finite train of electron pulses is extended to an infinite train of such pulses. The electrons are assumed to follow an idealized helical path through a space plasma in such a manner as to retain their respective position within the beam. This leads to radiation by coherent spontaneous emission. The waves of interest in this region are the whistler slow (compressional) and fast (torsional) Alfven waves. Although a general theory is developed, analysis is then restricted to two approximations, the short and long electron beam. Formulas for the radiation per unit solid angle from the short beam are presented as a function of both propagation and ray angles, electron beam pulse width and separation and beam current, voltage, and pitch angle. Similar formulas for the total power radiated from the long beam are derived as a function of frequency, propagation angle, and ray angle. Predictions of the power radiated are presented for representative examples as determined by the long beam theory.
Document ID
19850062508
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Harker, K. J.
(Stanford Univ. CA, United States)
Banks, P. M.
(Stanford University CA, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: Planetary and Space Science
Volume: 33
ISSN: 0032-0633
Subject Category
Geophysics
Accession Number
85A44659
Funding Number(s)
CONTRACT_GRANT: NAGW-235
CONTRACT_GRANT: F19628-84-K-0014
Distribution Limits
Public
Copyright
Other

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