Electrostatic Turbulence, Parallel Electric Fields, and Alfvénic Turbulence in the Plasma Sheet

Physics – Plasma Physics

Scientific paper

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[4475] Nonlinear Geophysics / Scaling: Spatial And Temporal, [5737] Planetary Sciences: Fluid Planets / Magnetospheres, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Intense electrostatic turbulence that includes double layers, electron phase-space holes, and other large-amplitude structures in the parallel electric field are observed to be associated with Alfvénic turbulence in the bursty bulk flow breaking region of the plasma sheet. Alfvénic turbulence is revealed through its strong earthward Poynting flux. This association suggests that Alfvén waves can interact with non-linear kinetic structures. The interaction is thought to take place through a match in perpendicular scales of electrostatic turbulence with those of kinetic Alfvén waves, even though the parallel scales of the Alfvén waves are many orders of magnitude larger than those of the non-linear kinetic structures. We suggest a scenario in which kinetic Alfvén waves with small perpendicular scales are generated in the turbulent bursty bulk flow breaking region. These waves drive strong, localized, field-aligned currents, which generate intense electrostatic turbulence. The rapid growth of parallel electric fields, in turn, alter the Alfvén waves. In essence, the strong electrostatic turbulence in the parallel electric field expedites the turbulent cascade of Alfvén waves to shorter scales.

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