Title
Nonlinear Fourier analysis for unmagnetized plasma wavesNonlinear Fourier analysis for unmagnetized plasma waves
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Department of Physics
Non-linear Waves
Publication type
article
Publication
Stockholm,
Subject
Physics
Source (journal)
Physica scripta. - Stockholm
Volume/pages
68(2003):1, p. 7-21
ISSN
0031-8949
ISI
000184274900001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We apply the nonlinear Fourier analysis developed by Callebaut [1] to an infinite homogeneous plasma calculating many higher order terms (computer algebra) and obtaining in this way some analytic expressions. (a) For cold plasma: the maximum amplitude is 2/e (i.e., 73% of n(0)) of the initial density no. otherwise the series diverges. For exponentials (sum of two waves) the maximum amplitude is halved, i.e n(0)/e. (b) For plasma with electron pressure, the radius of convergence decreases as the ratio of k(2)v(s-)(2) (1 + Gamma(-))/omega(-)(2) increases (Gamma(-) is the polytropic exponent; omega(-) is the plasma angular frequency for electrons; k is the wave number; v(s-) is the sound velocity for the electrons). (c) Suggestions for experimental verification are made. (d) In the limit of sound waves (no plasma) the radius of convergence is zero. Nevertheless the correct dispersion relation is obtained. A direct analysis confirmed these results for sound waves. (e) The cases where the method fails are indicated. (I) Plasma where both ions and electrons may move. are briefly considered (relevant for comet tails, fullerenes and electron-positron plasmas).
Full text (open access)
https://repository.uantwerpen.be/docman/irua/b15f5a/5881.pdf
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