Obliquely propagating ion-acoustic solitons and supersolitons in four-component auroral plasmas

Arbitrary amplitude nonlinear low frequency electrostatic soliton and supersoliton structures are studied in magnetized four-component auroral plasmas composed of a cold singly charged oxygen-ion fluid, Boltzmann distribution of hot protons and two distinct group of electron species. Using the Sagde...

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Bibliographic Details
Published in:Advances in space research 2016-02, Vol.57 (3), p.813-820
Main Authors: Rufai, O.R., Bharuthram, R., Singh, S.V., Lakhina, G.S.
Format: Article
Language:English
Subjects:
Acceleration
Auroral zone
Auroral zones
Earth’s magnetosphere
Low frequency waves
Mach number
Mach numbers
Magnetized plasmas
Mathematical models
Nonlinearity
Plasmas
Propagation
Solitons
Solitons and supersolitons
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Summary:Arbitrary amplitude nonlinear low frequency electrostatic soliton and supersoliton structures are studied in magnetized four-component auroral plasmas composed of a cold singly charged oxygen-ion fluid, Boltzmann distribution of hot protons and two distinct group of electron species. Using the Sagdeev pseudo-potential technique, the characteristics of obliquely propagating nonlinear structures are investigated analytically and numerically. The model supports the evolution of soliton and supersoliton structures in the auroral acceleration region. Depending on the parametric region, the positive and negative potential solitons coexists at lower Mach numbers, but at higher Mach numbers only negative potential solitons and supersolitons can exist. The presence of hot protons restricted the Mach number of the nonlinear structures to exist only at the subsonic region. The present investigation concurs with the Swedish Viking satellite observations in the auroral region.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2015.11.021