Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517261m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17261-17266.
Physics
6
E Region, Ionospheric Electron Density, Ionospheric Propagation, Radar Tracking, Radio Auroras, Radio Wave Refraction, Backscattering, Plasma Density
Scientific paper
This paper examines the hypothesis of Uspensky and Williams (1988) that the Canadian International Geophysical Year (IGY) radio aurora measurements of low (1-2 dB/deg) magnetic aspect sensitivity of 48 MHz scatter seen during the IGY in the Canadian sector can be explained by inadequate correction. The ionospheric conditions necessary to enable refraction/reflection to explain the Canadian IGY observations were investigated and were compared with those expected in the E-region ionosphere. It is shown that the refraction/oblique reflection is insufficient to explain the low value of aspect sensitivity deduced from the Canadian IGY auroral radar observations assuming ionospheric parameters typical of extended ionospheric layers; neither can these observations be explained by plasma density structures typical of some visual auroral forms. An alternative explanation is discussed.
McDiarmid D. R.
McNamara Allen G.
Watermann Jürgen
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