Longitudinal Plasma Waves in the Low‐Frequency Limit

In a partially ionized gas, two longitudinal wave modes propagate at high frequencies, the ion‐acoustic mode and the neutral‐acoustic mode. At very low frequencies, there are also two roots of the dispersion relation, one representing a damped wave and one representing an undamped wave. If the roots...

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Veröffentlicht in:	Physics of Fluids (U.S.) 1966-02, Vol.9 (2), p.274-276
1. Verfasser:	Parker, Lee W.
Format:	Artikel
Sprache:	eng
Schlagworte:	DISPERSION RELATIONS FREQUENCY IONS PHYSICS PLASMA Plasma Physics and Thermonuclear Processes PLASMA WAVES QUANTUM MECHANICS SCATTERING SCATTERING AMPLITUDE WAVE PROPAGATION
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container_title	Physics of Fluids (U.S.)
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creator	Parker, Lee W.
description	In a partially ionized gas, two longitudinal wave modes propagate at high frequencies, the ion‐acoustic mode and the neutral‐acoustic mode. At very low frequencies, there are also two roots of the dispersion relation, one representing a damped wave and one representing an undamped wave. If the roots are traced as a function of frequency from the high‐frequency regime to the low frequencies, the identification of the roots depends on the ratio of concentrations of ionized and neutral particles. In the low‐frequency limit, either the ion wave is damped or the neutral wave is damped, depending on the value of this ratio. The critical value is derived.
doi_str_mv	10.1063/1.1761669
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Auburn Research Associates, Inc., Cambridge, Mass</creatorcontrib><description>In a partially ionized gas, two longitudinal wave modes propagate at high frequencies, the ion‐acoustic mode and the neutral‐acoustic mode. At very low frequencies, there are also two roots of the dispersion relation, one representing a damped wave and one representing an undamped wave. If the roots are traced as a function of frequency from the high‐frequency regime to the low frequencies, the identification of the roots depends on the ratio of concentrations of ionized and neutral particles. In the low‐frequency limit, either the ion wave is damped or the neutral wave is damped, depending on the value of this ratio. 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Auburn Research Associates, Inc., Cambridge, Mass</creatorcontrib><title>Longitudinal Plasma Waves in the Low‐Frequency Limit</title><title>Physics of Fluids (U.S.)</title><description>In a partially ionized gas, two longitudinal wave modes propagate at high frequencies, the ion‐acoustic mode and the neutral‐acoustic mode. At very low frequencies, there are also two roots of the dispersion relation, one representing a damped wave and one representing an undamped wave. If the roots are traced as a function of frequency from the high‐frequency regime to the low frequencies, the identification of the roots depends on the ratio of concentrations of ionized and neutral particles. In the low‐frequency limit, either the ion wave is damped or the neutral wave is damped, depending on the value of this ratio. The critical value is derived.</description><subject>DISPERSION RELATIONS</subject><subject>FREQUENCY</subject><subject>IONS</subject><subject>PHYSICS</subject><subject>PLASMA</subject><subject>Plasma Physics and Thermonuclear Processes</subject><subject>PLASMA WAVES</subject><subject>QUANTUM MECHANICS</subject><subject>SCATTERING</subject><subject>SCATTERING AMPLITUDE</subject><subject>WAVE PROPAGATION</subject><issn>0031-9171</issn><issn>2163-4998</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1966</creationdate><recordtype>article</recordtype><recordid>eNp90L1OwzAYhWELgUQpDNxBxAZSij__JR5RRQEpEgwgRsuxv1Cj1oHYgLpxCVwjV0KrdmY6y6MzvIScAp0AVfwSJlApUErvkREDxUuhdb1PRpRyKDVUcEiOUnqllAkQfERU08eXkD98iHZRPCxsWtri2X5iKkIs8hyLpv_6_f6ZDfj-gdGtiiYsQz4mB51dJDzZ7Zg8za4fp7dlc39zN71qSsc05JJTVVnpbK072VKpKEoHXdt6j6yqmdCtV52sUXhOeaWUd547xj1FaqVFxsfkbPvbpxxMciGjm7s-RnTZCFkJYGKNzrfIDX1KA3bmbQhLO6wMULOpYsDsqqztxdZuvmwOffwH_wGcEWGK</recordid><startdate>196602</startdate><enddate>196602</enddate><creator>Parker, Lee W.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>196602</creationdate><title>Longitudinal Plasma Waves in the Low‐Frequency Limit</title><author>Parker, Lee W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c291t-3067a5ca89f5b0560e5c1fbbdde278249bd6f58e4d303766dcd3c23d0e0a5ae23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1966</creationdate><topic>DISPERSION RELATIONS</topic><topic>FREQUENCY</topic><topic>IONS</topic><topic>PHYSICS</topic><topic>PLASMA</topic><topic>Plasma Physics and Thermonuclear Processes</topic><topic>PLASMA WAVES</topic><topic>QUANTUM MECHANICS</topic><topic>SCATTERING</topic><topic>SCATTERING AMPLITUDE</topic><topic>WAVE PROPAGATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Parker, Lee W.</creatorcontrib><creatorcontrib>Mt. 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subjects	DISPERSION RELATIONS FREQUENCY IONS PHYSICS PLASMA Plasma Physics and Thermonuclear Processes PLASMA WAVES QUANTUM MECHANICS SCATTERING SCATTERING AMPLITUDE WAVE PROPAGATION
title	Longitudinal Plasma Waves in the Low‐Frequency Limit
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