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Modeling aperiodic magnetospheric oscillations.

Murchana Khusroo1, Madhurjya P Bora1

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This study shows that magnetohydrodynamics models with finite Larmor radius effects produce solitary waves, not regular oscillations, matching magnetopause observations.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Nonlinear Dynamics

Background:

  • Magnetospheric plasma dynamics are complex, involving nonlinear phenomena.
  • Previous models often assumed regular oscillations, which may not fully capture observed behaviors.

Purpose of the Study:

  • To analyze a Hall-magnetohydrodynamics model of magnetospheric plasma including finite Larmor radius effects.
  • To investigate the existence of periodic oscillations and alternative wave structures.

Main Methods:

  • Utilized bifurcation analysis on a nonlinear system derived from Hall-magnetohydrodynamics.
  • Focused on the behavior of magnetosonic waves within the model.

Main Results:

  • The nonlinear model does not exhibit limit cycles, ruling out constant-amplitude periodic oscillations.
  • The model generates trains of magnetosonic solitons with amplitudes increasing over time.
  • These findings align with observations of aperiodic magnetospheric oscillations at the magnetopause.

Conclusions:

  • The model provides a theoretical basis for observed non-constant amplitude solitary waves in the magnetosphere.
  • Finite Larmor radius effects are crucial for generating these realistic soliton trains.
  • The study redefines observed phenomena as aperiodic magnetospheric oscillations, driven by soliton dynamics.