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<p>The dynamics of ion-acoustic double layers in a magnetized plasma composed of cold ions and two populations of <i>q</i>-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 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(n_{ec}=0.2~cm^3\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(n_{eh}=1.8~cm^3\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(T_{ec}=1~eV\)</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(T_{eh}=26~eV\)</EquationSource> </InlineEquation> 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 <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(q_c\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(q_h\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\delta _c\)</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(T_{ch}\)</EquationSource> </InlineEquation> 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.</p>

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

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    2025年12月10日

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  • M. M. Hatami

摘要

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 \(n_{ec}=0.2~cm^3\) , \(n_{eh}=1.8~cm^3\) , \(T_{ec}=1~eV\) , and \(T_{eh}=26~eV\) 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 \(q_c\) , \(q_h\) , \(\delta _c\) , and \(T_{ch}\) 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.