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Cylindrical and spherical ion-acoustic envelope solitons in multicomponent plasmas with positrons
Umeå University, Faculty of Science and Technology, Department of Physics. Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; National Center for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan; Nonlinear Physics Centre and Center for Plasma Science and Astrophysics, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Max-Planck-Institut für extraterrestrische Physik, D-85741 Garching, Germany; GoLP/Institute of Plasmas and Nuclear Fusion, Instituto Superior Técnico, 1049-001 Lisbon, Portugal; CCLRC Centre for Fundamental Physics, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 0QX, UK; SUPA Department of Physics, University of Strathclyde, Glasgow G 40NG, UK; School of Physics, Faculty of Science and Agriculture, University of Kwazulu-Natal, Durban 4000, South Africa.
2009 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 79, no 5, 056402Article in journal (Refereed) PublishedText
Abstract [en]

The nonlinear wave modulation of planar and nonplanar (cylindrical and spherical) ion-acoustic envelope solitons in a collisionless unmagnetized electron-positron-ion plasma with two-electron temperature distributions has been studied. The reductive perturbative technique is used to obtain a modified nonlinear Schrodinger equation, which includes a damping term that accounts for the geometrical effect. The critical wave number threshold K(c), which indicates where the modulational instability sets in, has been determined for various regimes. It is found that an increase in the positron concentration (alpha) leads to a decrease in the critical wave number (K(c)) until alpha approaches certain value alpha(c) (critical positron concentration), then further increase in alpha beyond alpha(c) increases the value of K(c). Also, it is found that there is a modulation instability period for the cylindrical and spherical wave modulation, which does not exist in the one-dimensional case.

Place, publisher, year, edition, pages
American physical society , 2009. Vol. 79, no 5, 056402
Keyword [en]
electrons, modulational instability, nonlinear equations, perturbation theory, plasma ion acoustic waves, plasma solitons, plasma temperature, positrons, Schrodinger equation
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-116008DOI: 10.1103/PhysRevE.79.056402ISI: 000266500800063PubMedID: 19518571OAI: oai:DiVA.org:umu-116008DiVA: diva2:905477
Available from: 2016-02-22 Created: 2016-02-08 Last updated: 2016-03-03Bibliographically approved

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Shukla, Padma Kant
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