Volume 61, Issue 1 e202000085
ORIGINAL ARTICLE

Linear and nonlinear fluctuations of electron-temperature-gradient driven mode and electron acoustic mode in a two-electron temperature nonthermal magnetized plasma

Javaria Razzaq

Javaria Razzaq

Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad, Pakistan

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Qamar-ul- Haque

Corresponding Author

Qamar-ul- Haque

Theoretical Physics Division, PINSTECH, Nilore, Islamabad, Pakistan

Correspondence

Qamar-ul-Haque, Theoretical Physics Division, PINSTECH, P.O.Nilore, Islamabad, Pakistan.

Email: qamar_haque@hotmail.com

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Shahida Nargis

Shahida Nargis

Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad, Pakistan

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Arshad M. Mirza

Arshad M. Mirza

Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad, Pakistan

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First published: 12 August 2020

Funding information: Quaid-i-Azam University Research Fund, Higher Education Commission (HEC), 7632/Federal/NRPU/R&D/HEC/2017

Abstract

Nonlinear vortical structures and soliton formation are investigated for electron temperature gradient instability in a two-electron temperature non-Maxwellian magnetoplasma. The inhomogeneity in magnetic field is also considered. A new set of nonlinear equations, using transport equations of Braginskii”s model, are formulated to study the nonlinear structures. A modified linear dispersion relation of coupled electron temperature gradient (ETG) mode and electron acoustic wave is derived. The ETG instability is found to increase with increase in ηec value that increases with sharp density gradients. The results are applied to auroral region of earth's magnetosphere and the calculated values of the nonlinear electric field of fast solitary waves are found to be in agreement with the Viking satellite observations.

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