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Ion-acoustic vortex formation in a non-uniform two-electron-temperature magnetoplasma with sheared ion flow

Published online by Cambridge University Press:  17 October 2011

NAZIA BATOOL ,
ISMAT NAEEM ,
ARSHAD M. MIRZA  and
W. MASOOD
NAZIA BATOOL
Affiliation:
Theoretical Plasma Physics Group, Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ([email protected]) National Center of Physics (NCP), Islamabad 45320, Pakistan
ISMAT NAEEM
Affiliation:
Theoretical Plasma Physics Group, Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ([email protected])
ARSHAD M. MIRZA
Affiliation:
Theoretical Plasma Physics Group, Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ([email protected])
W. MASOOD
Affiliation:
National Center of Physics (NCP), Islamabad 45320, Pakistan Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 44000, Pakistan
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Abstract

We have investigated some linear as well as nonlinear properties of ion-acoustic wave (IAW) propagation in a non-uniform two-electron-temperature magnetoplasma in the presence of ion-sheared flows. In the linear limit, new dispersion relation has been derived and analyzed in some interesting limiting cases. It is shown that ion-sheared flow can drive the IAW unstable under a certain limit.Whereas, in the nonlinear case, dipolar and vortex street type solutions can appear. It is observed that by choosing some typical parameters of Earth's auroral region, the scalelength of the nonlinear structures are significantly modified. The present investigation might be very useful to explain various types of nonlinear structure formation which has been observed in space environments where two-electron-temperature plasma exist.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 1 , February 2012 , pp. 65 - 69
Copyright
Copyright © Cambridge University Press 2011

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