Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..235m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, March 1989, p. 235-238. Research supported by NSERC.
Physics
20
Atmospheric Refraction, Atmospheric Stratification, Auroral Zones, Ionospheric Propagation, Wave Reflection, Backscattering, E Region, Ionospheric Electron Density, Very High Frequencies
Scientific paper
Auroral structures are often accompanied by tilts to the electron density contours on the underside of the E-region. By including the effects of these tilts on radio wave refraction and reflection it is possible to understand many of the previously puzzling observations of VHF auroral backscatter at large angles away from perpendicularity to the earth's magnetic field. It is shown that many of the characteristics of echoes from the VHF Canadian Bistatic Auroral Radar System (BARS) are consistent with this process. For BARS observations for which the tilt hypothesis is correct, the resulting Doppler velocities can be interpreted in the same way as those from STARE, and use to give electric fields and convection patterns over the BARS field of view.
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