Physics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917503u&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,503-17,509
Physics
9
Angles (Geometry), Atmospheric Refraction, Auroras, Backscattering, Earth Ionosphere, Very High Frequencies, Electron Density (Concentration), Magnetic Fields, Ray Tracing, Snells Law, Wave Propagation
Scientific paper
This paper studies the effect of ionospheric refraction upon auroral radar backscatter under conditions where the aspect angle appears far from ideal, i.e., when the unrefracted ray path trajectory is at least a few degrees from the perpendicular to the Earth's magnetic field. It is found that wave trapping by curved electron density layers can cause ionospheric refraction as large as 20 deg, even at 150 MHz. This suggests that many so-called off-orthogonal VHF echoes are in reality due to backscattering at near-orthogonal aspect angles, the discepancy arising from increased ionospheric refraction by curved or tilted layers.
Koehler James A.
Pivovarov V. G.
Romanov V. I.
Sofko George J.
Uspensky M. V.
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