Abstract:
Arbitrary amplitude nonlinear low frequency electrostatic soliton and supersoliton structures are studied in magnetized fourcomponent
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.
