Investigation of ion acoustic double layers in magnetized plasma with two nonextensive electron species

The dynamics of ion-acoustic double layers in a magnetized plasma composed of cold ions and two populations of q-nonextensive electrons are investigated using the Sagdeev pseudopotential approach. The analysis identifies how key plasma parameters-including the Mach number, magnetic field obliquity, electron nonextensivity, and the temperature ratio between hot and cool electrons-govern the existence and polarity of nonlinear electrostatic structures. The present study focuses on the physically relevant domain of auroral-type plasmas, characterized by [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] where spacecraft observations suggest coexisting hot and cool non-Maxwellian electrons [Berthomier, M., Pottelette, R. and Malingre, M. J. Geophys. Res. 104, 4261 (1998)]. Within this parameter range, unlike unmagnetized plasmas with two nonextensive electron species, the model supports only positive-potential double layers. Rather than claiming full coverage of the high-dimensional parameter space, the present work provides a detailed and physically motivated sampling to illustrate how variations in plasma parameters such as [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] modify the Sagdeev potential landscape. These results thus offer a constrained but realistic theoretical basis for understanding nonlinear ion-acoustic structures in magnetized space plasmas.