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• W2015981244 abstract "In 1986 and 1987 the Sondrestrom incoherent scatter radar in Greenland was operated routinely in coordination with selected overpasses of the Polar Bear satellite. For these experiments the auroral ionospheric remote sensor on Polar Bear obtained images of auroral emissions in two far ultraviolet wavelength bands centered at approximately 136 and 160 nm and one visible band centered at 391.4 nm. Measurements at these three wavelengths were extracted from the images for comparison with the coincident radar measurements. Model calculations have shown that for Maxwellian incident electron distributions the ratio between the 136-nm luminosity and 391.4-nm luminosity can be used to estimate the mean energy of precipitating electrons. Once the mean energy is known, then either of the two emissions can be used to determine the total energy flux. This procedure is used to determine the properties of the incident electron distribution during three midnight sector auroral events over Sondre Stromfjord. The incident electron flux is then used to calculate the expected height profile of electron density which is compared with the simultaneous and coincident radar measurements. The results show that the derived profiles agree well with the measured profiles both in the peak electron density and the altitude of the peak. Differences between the measured and derived profiles below the peak are attributed to deviations between the actual spectral shape and the Maxwellian shape assumed in the modeling. Above the peak the observed differences may be due to the longer times required for the electron density to reach its steady state value. In spite of these differences the accuracy with which the peak of the profile is predicted by this technique is such that many important ionospheric parameters can be reliably inferred from remote measurements, including, for example, the height-integrated electrical conductivities." @default.
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• W2015981244 date "1992-03-01" @default.
• W2015981244 modified "2023-10-05" @default.
• W2015981244 title "Coordinated measurements made by the Sondrestrom radar and the Polar Bear Ultraviolet Imager" @default.
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• W2015981244 doi "https://doi.org/10.1029/91ja02803" @default.
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