Flow angle effects in E region 398-MHz auroral backscatter at small aspect angle

Details Flow angle effects in E region 398-MHz auroral backscatter at small aspect angle Flow angle effects in E region 398-MHz auroral backscatter at small aspect angle

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10113379m&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A6, p. 13379-13386

Physics

7

Ionosphere: Auroral Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Convection, Ionosphere: Plasma Temperature And Density

Scientific paper

A study of flow angle effects on small aspect angle backscatter from the auroral E region has been made using data obtained in the 1970s with the 398-MHz radar at Homer, Alaska. Several findings differ from previous results obtained at 140 MHz with the Scandinavian Twin Auroral Radar Experiment and the Sweden and Britain Radar-Auroral Experiment radars: (1) backscatter power is virtually independent of flow angle; (2) there is much less difference between type 1 and type 2 echoes; (3) as found in previous UHF studies, Doppler velocities of type 2 (low Doppler velocity) echoes vary with flow angle more rapidly than predicted by the ``cosine law.'' These differences are considered in the light of the recent strong turbulence theory developed by Hamza and St-Maurice [1993a,b].

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