Electrodynamic Coupling Between Plasma Sheet and the Auroral Zone due to Nonlinear Feedback interaction: Studies Based on Nonlinear Dispersive Field Line Resonance Model

Details Electrodynamic Coupling Between Plasma Sheet and the Auroral Zone due to Nonlinear Feedback interaction: Studies Based on Nonlinear Dispersive Field Line Resonance Model Electrodynamic Coupling Between Plasma Sheet and the Auroral Zone due to Nonlinear Feedback interaction: Studies Based on Nonlinear Dispersive Field Line Resonance Model

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51a0795p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51A-0795

Statistics

2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2772 Plasma Waves And Instabilities

Scientific paper

Auroral arc structure and mechanism of arc formation are examined using a nonlinear dispersive field line resonance (NDFLR) wave model that includes spatial and temporal effects arising from nonlinear modification of the ionospheric Pedersen conductivity. The inhomogeneity in the conductivity is induced by low energy ( ~ 150 eV) elactrons which precipitate in the auroral region from the plasma sheet. At the conjugate points where the field line resonance (FLR) encounters the ionosphere, the field-aligned current (FAC) increases the conductivity., reduces the FLR damping,and increases the FLR amplitude, that is, the FAC is intensified by the ionospheric feedback mechanism. Our studies show that the FAC carried by FLRs can grow to a significantly large amplitude and produce more pronounced structuring of a narrower width when compared with the case of uniform conductivity. A competition between the ionospheric feedback dissipation and the SAW dispersion results in large amplitude long-period oscillations of the FAC associated with emission of SAW wave-packets which propagate in the anti-Earthward (Northward) direction from the resonance. The NDFLR wave model predicts the current structure, electric field, and the magnetic field of FLRs based on conductivity in the nightside magnetosphere. These studies are consistent with the statistics of observations that discrete aurorae are formed in regions of low conductivity [Prakash and Rankin, 2001; Prakash et al., 2001]. We will present results on the auroral arc using the isotropic and anisotropic distribution in energy flux of the precipitating electrons that originate from plasma sheet. M. Prakash and Robert Rankin, Role of ionospheric effects and plasma sheet dynamics in the formation of auroral arc, Space Sci. Revs., 95 (1/2), 513, 2001. Prakash et al., Role of nonlinear feedback interactions in the formation and structuring of auroral arc, submitted to J. Geophys. Res., 2001.

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