Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4109h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4109-4120. Research supported by German-Gre
Physics
14
Auroral Zones, Backscattering, Coherent Radar, Power Spectra, Very High Frequencies, Electric Fields, Ion Acoustic Waves, Ion Cyclotron Radiation
Scientific paper
Fresh evidence is presented of type 3 auroral scatter obtained at 140 MHz from cross-beam radar measurements made at optimum magnetic aspect angles. The observations do not favor the electrostatic ion cyclotron mechanism, and they show that type 3 waves resemble in several ways the type 1 waves generated by the two-stream instability, e.g., they propagate in the same direction inside the same azimuthal sector at small angles to the electrojet E x B flow. A direct role is inferred for the ambient electric field in generating type 3 plasma waves as well. Type 3 and type 1 echoes can occur simultaneously over extended ionospheric areas and thus possibly originate at different altitudes. The possibility that type 3 echoes are simply due to type 1 waves originating in narrow sporadic ES layers located at lower electrojet altitudes is considered, and the effect of both an enhanced mean ionic mass and a large destabilizing electron density gradient component on lowering the phase velocity well below typical acoustic speed values is investigated.
Haldoupis Christos
Nielsen Edward
Schlegel Kristian
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