Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..111l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Feb. 1987, p. 111-114.
Physics
63
Auroral Zones, Eiscat Radar System (Europe), Ion Distribution, Ionospheric Ion Density, Velocity Distribution, Electric Fields, F Region, Incoherent Scatter Radar
Scientific paper
Observations from the EISCAT incoherent scatter radar have revealed bursts of poleward ion flow in the dayside auroral ionosphere which are consistent with the ionospheric signature of flux transfer events at the magnetopause. These bursts frequently contain ion drifts which exceed the neutral thermal speed and, because the neutral thermospheric wind is incapable of responding sufficiently rapidly, toroidal, non-Maxwellian ion velocity distributions are expected. The features are strongly suggestive of a toroidal distribution: characteristic spectral shape, increased scattered power (both consistent with reduced Landau damping and enhanced electric field fluctuations) and excessively high line-of-sight ion temperatures deduced if a Maxwellian distribution is assumed. The distributions are non-Maxwellian whenever the ion drift exceeds the neutral thermal speed, indicating that such distributions can exist over the time scale of the flow burst events (several minutes).
Bromage Barbara J. I.
Horne Richard B.
Lockwood Marian
St-Maurice J.-P.
Willis David M.
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