Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0821p&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0821
Physics
2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling
Scientific paper
Application of a 3D numerical model of mangetosphere-ionopshere coupling to the generation of Alfvén waves, Alfvén resonances and electron precipitation stimulated by active ionospheric heating experiments is described. The numerical model includes a model of the horizontally inhomogeneous auroral ionosphere with conductivity dynamics coupled to a two-fluid MHD model describing dispersive shear Alfvén dynamics in the magnetosphere. Under favorable conditions of low ionospheric conductivity and strong convection electric field, an ionospheric feedback instability initiated by conductivity modifications works as a driver for resonant Alfvén waves that develop in the magnetosphere. Effects of plasma anomalous resistivity in the large field-aligned currents of the feedback-driven Alfvén waves generate fluxes of energetic electrons that precipitate into the ionosphere producing auroral luminosity. Recent experiments of modulated heating of the auroral electrojet by incoherent scatter radars [Robinson et al., 2000] have confirmed that a localized enhancement of the ionospheric conductivity in the presence of ionospheric convection stimulates precipitation of energetic electron fluxes into the ionosphere. The results of these simulations provide insights into the magnetospheric processes that cause the precipitation and allow us to estimate the precipitating electron energy flux for given ambient conditions.
Lotko William
Pokhotelov Dimitri
Streltsov Anatoly V.
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