FIZIKA A 16 (2007) 1 , 25-38

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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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