Abstract
Weak ion acoustic (IA) solitary waves are investigated in a mixed nonextensive high energy-tail electron distribution, focusing on the influence of an interplay between nonthermality and nonextensivity on the IA soliton nature, its carried energy and associated rogue waves. The IA soliton exhibits compression or rarefaction depending on the strength of nonextensivity and the amount of nonthermality. The latter favors the development of rarefactive solitary structures, i.e., their corresponding q-interval enlarges as α increases. In a pure nonextensive plasma (α = 0), the energy carried by the IA soliton first decreases with q before increasing beyond a local minimum. The latter is shifted toward higher values of the nonextensive parameter q as α is increased. Moreover, nonthermal effects may render stronger the associated IA rogue waves.
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