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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 10
Ann. Geophys., 31, 1681–1687, 2013
https://doi.org/10.5194/angeo-31-1681-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 31, 1681–1687, 2013
https://doi.org/10.5194/angeo-31-1681-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 09 Oct 2013

Regular paper | 09 Oct 2013

Enhanced EISCAT UHF backscatter during high-energy auroral electron precipitation

N. M. Schlatter1, N. Ivchenko1, T. Sergienko2, B. Gustavsson3, and B. U. E. Brändström2 N. M. Schlatter et al.
  • 1School of Electrical Engineering, Royal Institute of Technology, Teknikringen 31, 100 44 Stockholm, Sweden
  • 2Institute for Space Physics, Rymdcampus 1, 981 92 Kiruna, Sweden
  • 3EISCAT scientific association, Rymdcampus 1, 981 92 Kiruna, Sweden. Now at: Department of Physics and Technology, University of Tromsø, 9037 Tromsø, Norway

Abstract. Natural enhancements in the backscattered power of incoherent scatter radars up to 5 orders of magnitudes above the thermal backscatter are sometimes observed at high latitudes. Recently observations of enhancements in the backscattered power including a feature at zero Doppler shift have been reported. These enhancements are limited in altitude to tens of kilometers. The zero Doppler shift feature has been interpreted as a signature of electron density cavitation. Enhanced plasma lines during these observations have also been reported. We report on the first EISCAT UHF observations of enhanced backscattered radar power including a zero Doppler shift feature. The enhancements originated from two distinct and intermittent layers at about 200 km altitude. The altitude extent of the enhancements, observed during auroral high-energy electron precipitation, was < 2 km.

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