Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2273s&link_type=abstract
Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2273-2285.
Physics
12
Digital Simulation, Electrostatics, Geomagnetic Tail, Magnetohydrodynamic Turbulence, Magnetospheric Instability, Space Plasmas, Atmospheric Turbulence, Auroras, Electric Potential, Electron Acceleration, Geomagnetism, Ion Beams, Ion Motion, Kinetic Energy, Magnetic Fields, Mathematical Models, Two Dimensional Models, Velocity Distribution
Scientific paper
A two-dimensional plasma model is used to investigate the development of electrostatic turbulence in a magnetized plasma from plasma instabilities. The simulation consists of following the motion of 100,000 ions in their self-consistent electrostatic field. The electrons are treated as a constant neutralizing background. The instabilities modeled are driven by a ring-type velocity distribution and by interpenetrating ion beams in a time-variable magnetic field. Instability growth times are of the order of an ion gyroperiod in the case of the ring distribution and of the order of an ion plasma period in the case of the beam simulation. Maximum potential differences generated are of the order of the ion kinetic energies. These simulations demonstrate the cascade of wave energy to long wavelengths, thus showing the E x B turbulence can be generated from plasma microinstabilities. After the free energy feeding, the instabilities are exhausted, and wave energy at wavelengths less than an ion gyrodiameter decays quickly to equilibrium levels, while longer wavelength modes persist for much longer times. In one model with a time dependent, but spatially uniform, magnetic field the electric field energy at long wavelengths appeared to increase as a result of the increase of the magnetic field.
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