Obliquely propagating ion acoustic waves in the auroral E region - Further evidence of irregularity production by field-aligned electron streaming

Details Obliquely propagating ion acoustic waves in the auroral E region - Further evidence of irregularity production by field-aligned electron streaming Obliquely propagating ion acoustic waves in the auroral E region - Further evidence of irregularity production by field-aligned electron streaming

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7833v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7833-7846. Research supported by DRET and DNA.

Physics

26

Auroral Zones, E Region, Field Aligned Currents, Ion Acoustic Waves, Ionospheric Disturbances, Ionospheric Propagation, Decametric Waves, Hall Effect, Ionospheric Drift, Labrador, Phase Velocity

Scientific paper

Common volume observations of E region high-latitude irregularities at decameter wavelengths have been obtained with the JHU/APL HF radar located at Goose Bay, Labrador, and the SHERPA HF radar located at Schefferville, Quebec. This paper analyzes an event with characteristics similar to those of a distinctive type of event described by Villain et al. (1987). The experimental configuration, which combines the azimuthal-scanning capability of the Goose Bay radar with the frequency-scanning operation of the Schefferville radar, has provided unambiguous evidence of the existence of two irregularity layers at different altitudes within the E region. The layers, which exhibit different characteristics, can be related to the action of the gradient drift and ion acoustic instability mechanisms. It is inferred that the observed irregularities are produced through a combination of perpendicular and field-aligned relative electron-ion drifts.

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