Coherent HF radar backscatter from small-scale irregularities in the dusk sector of the subauroral ionosphere

Details Coherent HF radar backscatter from small-scale irregularities in the dusk sector of the subauroral ionosphere Coherent HF radar backscatter from small-scale irregularities in the dusk sector of the subauroral ionosphere

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9312871r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Nov. 1, 1988, p. 12871-12882. DNA-USAF-supported research.

Other

17

Auroral Zones, Backscattering, Coherent Radar, Ionospheric Disturbances, Plasma Density, Radar Scattering, Doppler Radar, F Region, Field Of View, High Frequencies

Scientific paper

This paper describes the characteristics of backscatter from decameter-scale ionospheric plasma density irregualarities, observed with an impressive regularity by the Goose Bay (Labrador) high-frequency (HF) radar in the dusk sector of the winter ionosphere, and discusses the relation of the scatter to the midlatitude trough. It is shown that this dusk scatter can be readily distinguished from other types of late afternoon/early evening scatter by the extreme equatorward position of its source region and by the low values of its associated radar Doppler velocities (not above 200 m/s) and spectral widths (not more than 200 m/s). A comparison of the radar observations with nearly simultaneous particle precipitation data obtained with the DMSP F6 satellite demonstrated that the source region of the backscatter lies within the subauroral ionosphere. It is shown that the characteristics of dusk scatter are compatible with the Spiro et al. (1978) model of the electrodynamics of the midlatitude trough.

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