Periodic low-frequency electric field structures in a magnetized non-thermal auroral plasma

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rufai_periodic low-frequency_2019.pdf (625.82 KB)

Date

2019

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Elsevier

Abstract

The theoretical explanation of electric field structures associated with density depletion in the Earth’s upper ionosphere is presented. Using the quasi-neutrality hypothesis, the effect of excess energetic electron species is studied on the evolution of nonlinear low-frequency ion-cyclotron and ion-acoustic waves in a magnetized auroral plasma. The dynamics of the cold ion beam is governed by the fluid equations and the electron is treated as energetic species with non-thermal density distribution. Numerical computations appear in a series of periodic oscillations, such as spiky, sawtooth and sinusoidal waveforms. The present model can generate up to 18 mV/m electric field amplitude, which is in the range of the FREJA satellite measurements in the auroral acceleration region.

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Keywords

Geophysics, Physics, Low-frequency, Mathematics, Auroral plasma

Citation

Rufai, O.R. (2019). Periodic low-frequency electric field structures in a magnetized non-thermal auroral plasma. Heliyon, 5(7), e01976. https://doi.org/10.1016/j.heliyon.2019.e01976

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https://doi.org/10.1016/j.heliyon.2019.e01976
 http://hdl.handle.net/10566/8345

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Research Articles (Physics)