Browsing by Author "Rufai, Odutayo Raji"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Periodic low-frequency electric field structures in a magnetized non-thermal auroral plasma
    (Elsevier, 2019) Rufai, Odutayo Raji
    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.