Dynamics of large-scale vortical structures in electron-positron-ion plasmas

Generation of zonal flows by electrostatic drift waves in electron-positron-ion plasmas

“…This is the reason that zonal flows driven by drift-type turbulence have been intensively investigated theoretically in recent years. [99][100][101][102][103][104][105][106][107][108][109][110][111][112][113] Another reason for the investigation carried out in the given paper are the results obtained by Kaladze et al 86 In that paper it was shown that in EPI plasma three different types of nonlinear solitary vortical structures on the electrostatic drift waves can appear. ͑1͒ Short-scale vortical structures of dipole type stipulated by the vector nonlinearity only.…”

“…the classical HM equation ͑containing only vector nonlinearity͒ can be isolated, which has the form 86 − Ze…”

“…In Sec. II a brief description of the peculiarities of dynamics of electrostatic drift waves in EPI plasma 86 is presented. Using the analytic method of parametric instabilities 107,109-111 a set of coupled equations describing the nonlinear interaction of drift waves and zonal flows is derived in Sec.…”

Drift wave driven zonal flows in electron–positron–ion plasmas

“…Because of the long lifetime of positrons, most astrophysical (Lee et al 2005;Zheleznyakov and Koryagin 2005) and laboratory plasmas (Greaves and Surko 1995;Helander and Ward 2003;Salamin et al 2006) become an admixture of electrons, positrons and ions. In order to grasp the basic physics of the threecomponent electron-positron-ion (EPI) plasmas, several theoretical investigations have been carried out (Popel et al 1995;Jammalamadaka et al 1996;Pokhotelov et al 2001;Mahmood and Saleem 2003;Saleem and Mahmood 2003;Shukla et al 2003a, b;Haque and Saleem 2004;Eliasson and Shukla 2005;Hall and Shukla 2005;Haque et al 2005;Esfandyari-Kalejahi et al 2006;Kourakis et al 2007;Moslem et al 2007;Masood 2008;Mushtaq 2008;Dubinov and Sazonkin 2009;Kaladze et al 2009) within the framework of multifluid theory which is applied to both astrophysical and laboratory plasmas.…”

“…Vortex structures of the coupled electrostatic drift and ion-acoustic waves in a strongly magnetized EPI plasma in the presence of sheared ion flow were found by Shukla et al (2003a). Large-scale vortex electrostatic drift structures in EPI plasma were investigated by Kaladze et al (2009). Pokhotelov et al (2001) investigated the nonlinear dynamics of drift Alfvén waves in an inhomogeneous electronpositron plasma with a small admixture of heavy ions and two-dimensional dipolar vortices.…”