Filamentation of plasma in the auroral region by an ion-ion instability - A process for the formation of bidimensional potential structures

Details Filamentation of plasma in the auroral region by an ion-ion instability - A process for the formation of bidimensional potential structures Filamentation of plasma in the auroral region by an ion-ion instability - A process for the formation of bidimensional potential structures

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710801m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,801-10,810. Research supported by CNRS.

Physics

Plasma Physics

15

Auroral Zones, Digital Simulation, Electrostatic Waves, Ion Beams, Plasma Physics, Electron Density (Concentration), Gyrofrequency, Larmor Radius, Solitary Waves, Viking Spacecraft

Scientific paper

The nonlinear behavior of electrostatic ion waves generated by an ion beam flowing through a thermal ion and electron background in a strongly magnetized plasma is investigated by means of a 2D, explicit, electrostatic particle code. To follow the nonlinear evolution of these ion waves, a long-lasting simulation is run with a large simulation grid: 128 x 512 lambda(d). Beam ions are shown to generate oblique waves. The nonlinear beatings between these oblique waves produce purely transverse waves, which leads to a strong modulation of the density and of the electric potential in a direction transverse to the magnetic field. The transverse scale of these essentially field-aligned filaments is 10 rho(i), where rho(i) is the ion Larmor radius of beam ions. Within these filaments, relatively stable field-aligned density and potential structures develop. Unlike the potential structures that develop in a two-component plasma with downgoing electrons, these structures move upward.

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