Ion- and dust-acoustic solitons in dusty plasmas: Existence conditions for positive and negative potential solutions
- Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium and School of Physics (Howard College Campus), University of KwaZulu-Natal, Durban 4041 (South Africa)
The usual description of dust-modified ion-acoustic and dust-acoustic solitons in plasmas containing negative dust is in terms of Boltzmann distributions for the hotter species. In the dust-modified ion-acoustic regime, besides positive potential solitons, negative structures can also be generated, for electrons with a polytropic index {gamma}{sub e}{ne}1, as well as for Boltzmann electrons, subject to conditions that are not too stringent. These general conditions were previously either ignored or given for weakly nonlinear solutions only. In the dust-acoustic domain in plasmas with negatively charged dust, however, only negative potential solitons can occur, even when the lighter species have non-Boltzmann distributions. For Boltzmann electrons only an infinite dust compression limits the soliton amplitudes and corresponding Mach numbers, whereas for {gamma}{sub e}{ne}1, the electron density, too, can be a limiting factor for the existence domain of such solitons.
- OSTI ID:
- 20764460
- Journal Information:
- Physics of Plasmas, Vol. 12, Issue 8; Other Information: DOI: 10.1063/1.2001347; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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