Electrostatic structures associated with dusty electronegative magnetoplasmas
2010 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 12, 073010Article in journal (Refereed) Published
By using the hydrodynamic equations of positive and negative ions, the Boltzmann electron density distribution and the Poisson equation with stationary dust, a three-dimensional (3D) Zakharov-Kuznetsov (ZK) equation is derived for small but finite amplitude ion-acoustic waves. However, the ZK equation is not appropriate to describe the system either at critical plasma compositions or in the vicinity of the critical plasma compositions. Therefore, the modified ZK (MZK) and extended ZK (EZK) equations are derived. The generalized expansion method is used to analytically solve the ZK, MZK and EZK equations. A new class of solutions that admits a train of well-separated bell-shaped periodic pulses is obtained. In certain conditions, the latter degenerates to either solitary or shock wave solutions. The effects of the physical parameters on the nonlinear structures are examined in many plasma environments having different negative ion species, such as D- and F-regions of the Earth's ionosphere, as well as in laboratory plasma experiments. Numerical analysis of the solutions revealed that the profile of the nonlinear pulses suffers amplitude and width modifications due to enhancement of the dust practices, negative ions, positive-to-negative ion mass ratio and positive/negative ion cyclotron frequency. Furthermore, the necessary conditions for both solitons and shocks propagation as well as their polarity are examined.
Place, publisher, year, edition, pages
[Moslem, W. M.] Port Said Univ, Fac Sci, Dept Phys, Port Said, Egypt. [Abdelsalam, U. M.] Fayoum Univ, Fac Sci, Dept Math, Al Fayyum, Egypt. [Sabry, R.] Mansoura Univ, Fac Sci, Dept Phys, Theoret Phys Grp,Damietta Branch, New Damietta 34517, Egypt. [Shukla, P. K.] Ruhr Univ Bochum, Inst Theoret Phys 4, Fak Phys & Astron, D-44780 Bochum, Germany. [Shukla, P. K.] Umea Univ, Dept Phys, SE-90187 Umea, Sweden. [Moslem, W. M.] Suez Canal Univ, Fac Sci Port Said, Dept Phys, Ismailia, Egypt. [Shukla, P. K.] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany. [Shukla, P. K.] Inst Super Tecn, GoLP, P-1049001 Lisbon, Portugal. [Shukla, P. K.] Rutherford Appleton Lab, CCLRC Ctr Fundamental Phys, Didcot 0X11 0QX, Oxon, England. [Shukla, P. K.] Univ Strathclyde, SUPA Dept Phys, Glasgow G4 0NG, Lanark, Scotland. [Shukla, P. K.] Univ Kwazulu Natal, Fac Sci & Agr, Sch Phys, ZA-4000 Durban, South Africa., 2010. Vol. 12, 073010
IdentifiersURN: urn:nbn:se:umu:diva-109615DOI: 10.1088/1367-2630/12/7/073010ISI: 000279881200001OAI: oai:DiVA.org:umu-109615DiVA: diva2:858633