Plasma turbulence in the vicinity of a magnetic neutral line

Physics

Scientific paper

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Collisionless Plasmas, Geomagnetic Tail, Ion Acoustic Waves, Plasma Jets, Plasma Turbulence, Astronomical Models, Electric Fields, Electron Distribution, Electron Energy, Low Frequencies, Magnetohydrodynamic Flow, Neutral Sheets, Plasma Spectra, Power Spectra, Solar Flares, Steady State

Scientific paper

The SLIM (steady state linear quadrupole) device, consisting of a rectangular vacuum chamber 152 cm long, enclosing two current carrying conductors separated by 32 cm, was used to study the behavior of a collisionless plasma in the vicinity of a magnetic neutral line under the influence of an electric field applied parallel to the neutral line. A gross redistribution of the plasma occurs as a consequence of the E x B flows and the current flowing along the neutral line drives a complex spectrum of ion acoustic waves that saturates just prior to electric field saturation. The bulk and tail temperature of the electron distribution increase as the amplitude of the power spectrum increases, with a simultaneous increase in the number of hot electrons comprising the tail. As the electric field saturates, the power spectrum grows turbulent resulting in a disruptive current flow and an anomalously high resistivity. Such a process may play an important role in the generation of energetic particles in solar flares and the geomagnetic tail neutral sheet.

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