Saturation of turbulent energy density in field-aligned currents

Details Saturation of turbulent energy density in field-aligned currents Saturation of turbulent energy density in field-aligned currents

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988kosis..26..247s&link_type=abstract

Kosmicheskie Issledovaniia (ISSN 0023-4206), vol. 26, Mar.-Apr. 1988, p. 247-255. In Russian.

Physics

Atmospheric Turbulence, Electrostatic Waves, Field Aligned Currents, Magnetohydrodynamic Turbulence, Magnetospheric Instability, Auroral Zones, Ion Acoustic Waves, Ion Cyclotron Radiation, Plasma Resonance

Scientific paper

An analysis is made of the saturation of the level of electrostatic turbulence W/nT during the passage of a field-aligned current (FAC) in the magnetosphere as a function of the density of the FAC j-parallel. It is shown that this effect can be explained by the excitation of electrostatic ion-cyclotron and ion-acoustic turbulence on auroral field lines. If the stabilization mechanism of the ion-cyclotron instability is the broadening of ion resonances, then the dependence of W/nT on j-parallel corresponds to the limitation of turbulent energy density with increasing current. More intense FACs excite the Bunemann instability and even the ion-acoustic instability in the Sagdeev regime.

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