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Title: Existence domains of dust-acoustic solitons and supersolitons

Using the Sagdeev potential method, the existence of large amplitude dust-acoustic solitons and supersolitons is investigated in a plasma comprising cold negative dust, adiabatic positive dust, Boltzmann electrons, and non-thermal ions. This model supports the existence of positive potential supersolitons in a certain region in parameter space in addition to regular solitons having negative and positive potentials. The lower Mach number limit for supersolitons coincides with the occurrence of double layers whereas the upper limit is imposed by the constraint that the adiabatic positive dust number density must remain real valued. The upper Mach number limits for negative potential (positive potential) solitons coincide with limiting values of the negative (positive) potential for which the negative (positive) dust number density is real valued. Alternatively, the existence of positive potential solitons can terminate when positive potential double layers occur.
Authors:
 [1] ;  [2] ; ;  [3]
  1. South African National Space Agency (SANSA) Space Science, PO Box 32, Hermanus 7200 (South Africa)
  2. University of the Western Cape, Robert Sobukwe Road, Bellville 7535 (South Africa)
  3. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410218 (India)
Publication Date:
OSTI Identifier:
22220700
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; BOLTZMANN EQUATION; DUSTS; ION ACOUSTIC WAVES; MACH NUMBER; PLASMA DENSITY; PLASMA SHEATH; POTENTIALS; SOLITONS; SPACE