Ion acoustic solitons in a plasma with two-temperature kappa-distributed electrons

Abstract

Existence domains and characteristics of ion acoustic solitons are studied in a two-temperature electron plasma with both electron components being kappa-distributed, as found in Saturn’s magnetosphere. As is the case for double-Boltzmann electrons, solitons of both polarities can exist over restricted ranges of fractional hot electron density ratio for this plasma model. Low κ values, which indicate increased suprathermal particles in the tail of the distribution, yield a smaller domain in the parameter space of hot density fraction and normalized soliton velocity (f, M), over which both soliton polarities are supported for a given plasma composition (the coexistence region). For some density ratios that support coexistence, solitons occur even at the lowest (critical) Mach number (i.e., at the acoustic speed), as found recently for a number of other plasma models. Like Maxwellians, low-κ distributions also support positive potential double layers over a narrow range of low fractional cool electron density (<10%).

Ion-acoustic solitons in plasma: an application to Saturn’s magnetosphere

“…Indeed, both compressive and rarefactive solitons can be supported by the model for some plasma parameters, which is in good agreement with earlier works of Saini et al (2014), Baluku et al (2010). (ii) Superthermality of hot and cold electrons (κ h and κ c ) have significant and opposite effects on the solitons profiles.…”

“…For example, Baluku and Hellberg (2012) studied the existence domains and characteristic behaviors of the ion acoustic soliton to exist in an unmagnetized plasma with two temperature kappa-distributed electrons. Lately, Shahmansouri and Alinejad (2013a, 2013b) studied the linear and nonlinear excitations of arbitrary amplitude ion acoustic solitary waves in a magnetized plasma comprising two temperature electrons and cold ions.…”

Modulation of ion-acoustic waves in a nonextensive plasma with two-temperature electrons

“…Jones et al [5] reported experimentally the existence of ion acoustic solitary waves (IASWs) in plasmas with hot and cold electrons. Baluku et al [13] studied small-amplitude ion-acoustic solitons in a plasma with two-temperature kappa distributed electrons and found that superthermality of electrons played an important role for the modification of solitary structures.…”

Electrostatic Shock Structures in Nonextensive Plasma with Two Distinct Temperature Electrons

“…The concept of two-temperature electrons (electrons with two distinct temperatures) is now well established from the theoretical [34][35][36][37][38] and experimental [39,40] points of view. Thus, at equilibrium the quasineutrality condition implies, n i0 = n e10 + n e20 + Z d n d0 , where n s0 is the unperturbed number densities of the species s (here s = i, e1, e2, d for ion, electrons with temperature T e1 , electrons with temperature T e2 , and immobile dust, respectively) and Z d is the number of electrons residing onto the dust grain surface.…”