Evolution of ion acoustic solitary waves in pulsar wind

2020 ◽  
Vol 500 (2) ◽  
pp. 1612-1620
Author(s):  
Kuldeep Singh ◽  
Amar Kakad ◽  
Bharati Kakad ◽  
Nareshpal Singh Saini
Keyword(s):  
Solitary Waves ◽  
Collisionless Plasma ◽  
Dynamical Evolution ◽  
Astrophysical Plasmas ◽  
Ion Density ◽  
Electrons And Positrons ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic ◽  
Pulsar Wind ◽  
Superthermal Electrons And Positrons

ABSTRACT We have studied the evolution of ion acoustic solitary waves (IASWs) in pulsar wind. The pulsar wind is modelled by considering a weakly relativistic unmagnetized collisionless plasma comprised of relativistic ions and superthermal electrons and positrons. Through fluid simulations, we have demonstrated that the localized ion density perturbations generated in the polar wind plasma can evolve the relativistic IASW pulses. It is found that the concentration of positrons, relativistic factor, superthermality of electrons, and positrons have a significant influence on the dynamical evolution of IASW pulses. Our results may provide insight to understand the evolution of IASW pulses and their role in astrophysical plasmas, especially in the relativistic pulsar winds with supernova outflow, which is responsible for the production of superthermal particles and relativistic ions.

Effect of non-extensivity during the collision between inward and outward ion acoustic solitary waves in cylindrical and spherical geometry

2013 ◽  
Vol 79 (5) ◽  
pp. 789-795 ◽  
Author(s):  
UDAY NARAYAN GHOSH ◽  
PRASANTA CHATTERJEE
Keyword(s):  
Phase Shift ◽  
Perturbation Method ◽  
Solitary Waves ◽  
Spherical Geometry ◽  
Planar Geometry ◽  
Extended Version ◽  
Electrons And Positrons ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic ◽  
Analytical Phase

AbstractThe head-on collision between two cylindrical/spherical ion acoustic solitary waves (IASWs) in un-magnetized plasmas comprising inertial ions and q-non-extensive electrons and positrons is investigated using the extended version of the Poincaré–Lighthill–Kuo perturbation method. How the interactions are taking place in cylindrical and spherical geometry are studied, and the collision is shown at different times. The non-planar geometry can modify analytical phase shifts following the head-on collision are derived. The effects of q-non-extensive electrons and positrons on the phase shift are studied. It is shown that the properties of the interaction of IASWs in cylindrical and spherical geometry are very different.

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