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FIZIKA A 16 (2007) 1 , 25-38
 
EFFECTS OF IONIC TEMPERATURES ON PHASE VELOCITIES OF
ION-ACOUSTIC SOLITARY WAVES IN A DRIFT NEGATIVE-ION PLASMA WITH SINGLE
TEMPERATURE ELECTRON
SANKAR CHATTOPADHYAYa,b
aCentre for Theoretical Plasma Research, 346, R. K. Pally (Balaka),
Sonarpur, Kolkata-700150, India
bDepartment of Mathematics, Daria J. L. N Vidyalaya, West Bengal, India
E-mail address: sankar_djln@yahoo.com
Received 7 June 2005 Accepted 28 June 2006
Online 22 May 2007
Propagation of ion-acoustic solitary waves in a collisionless, unmagnetised
single-electron-temperature plasma containing warm positive and negative ion
drifts of equal temperatures is studied. It is found that, if the ions have
finite temperatures, then there exist two modes, namely the slow and the fast
ion-acoustic mode. The effect of ionic temperatures and negative ions on phase
velocities (the fast and slow ion-acoustic modes) of the solitary waves are
discussed for the plasmas having (He+, O-),(He+, Cl-) and (H+, O-) ions.
PACS numbers: 52.35.Fp, 52.35.Sb
UDC 531.742, 531.755
Keywords: ion-acoustic solitary waves, drift motion, phase velocity, slow
and fast modes
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