Competition Between Langmuir Wave-Wave and Wave-Particle Interactions in the Auroral Ionosphere

Physics

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Plasma Turbulence

Scientific paper

Spacecraft frequently measure intense bursts of Langmuir waves in conjunction with field-aligned electrons in the auroral ionosphere. A numerical simulation model which includes both wave-wave and wave-particle effects has been constructed to model these observations. This model is based on differential equations and has very low noise allowing us to examine the evolution of the extremely weak precipitating electron beams observed in the auroral ionosphere. Our model evolves the electron distribution function and Langmuir wave spectrum self-consistently by coupling the 1-D quasilinear diffusion equation (which evolves the electrons) to the 2-D magnetized Zakharov equations (which evolve the wave spectrum). The model is applied to the auroral ionosphere at altitudes near 700 km. Results show that wave-wave and wave-particle effects act on similar timescales. The simulation results are in reasonable agreement with spacecraft measurements.

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