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- W1965360041 abstract "The role of ionospheric refraction in observing coherent radar backscatter from the auroral E region has recently come into the discussion again when it was proposed that for 50 MHz radars refraction efficiently brings the radar beams to virtually perpendicular intersection with the geomagnetic field at the scatter location and thus explains a number of otherwise puzzling results. However, without a thorough calculation of the actual refraction under the given ionospheric conditions its effect cannot be assessed accurately since it is not simply the maximum electron density and layer tilt but rather the product of density gradient and beam propagation distance measured along the contours of constant density which determines the refraction. In order to study typical refraction features a ray tracing computer program was applied to an ionospheric model consisting of an auroral arc with high electron density imbedded in a horizontally stratified ionosphere. It turns out that, when adapted to the Canadian BARS Red Lake radar, a sufficiently enhanced electron density within the arc can bring the radar beam to virtually perpendicular intersection with the geomagnetic field at ranges exceeding the distance from the radar to the centre of the arc by about 100 to 150 km." @default.
- W1965360041 created "2016-06-24" @default.
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- W1965360041 date "1990-09-01" @default.
- W1965360041 modified "2023-10-14" @default.
- W1965360041 title "Refraction of 50-MHz radar waves in a realistic ionospheric model" @default.
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- W1965360041 doi "https://doi.org/10.1029/rs025i005p00805" @default.
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