Polarization electric field and Farley-Buneman instability during a precipitation event

Details Polarization electric field and Farley-Buneman instability during a precipitation event Polarization electric field and Farley-Buneman instability during a precipitation event

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..509d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 4, p. 509-523

Mathematics

Auroral Electrojets, E Region, Electric Fields, Electron Precipitation, Ionospheric Drift, Magnetohydrodynamic Stability, Polarization (Charge Separation), Atmospheric Models, Auroral Zones, Eiscat Radar System (Europe), Geomagnetism, Relaxation Method (Mathematics)

Scientific paper

An anomalous polarization electric field may be set-up in the lower auroral E-region in response to an electron precipitation event during unstable electojet conditions. For instance, observations during post-midnight to early morning hours on 06-07 June 1990, using the European Incoherent Scattering Scientific Association (EISCAT) radar facility in Scandinavia, show that the in-sutu dynamics of the E-region ionization may be radically affected by the presence of the Farley-Buneman instability. In this case, the measured ion drifts at 105 km height are exceptionally strong and comparable in magnitude with the E x B-drift in the F-region, mapped along the same magnetic field-line. In this paper we present a model to explain the main features of these observations. We assume a simple relaxation model for the E-region ionization generated by an instantaneous electron precipitation event during diffuse aurora conditions and in the presence of the Farley Buneman instability. In these conditions and for times smaller than the ionization lifetime (tens seconds to a few minutes), the induced polarization electric field to restore charge quasi-neutrality may radically increase the ion drift velocity, and effectively decouple the ion motion from the dynamics of the neutral atmosphere.

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