Enhanced EISCAT UHF backscatter during high-energy auroral electron precipitation

Schlatter, N. M.; Ivchenko, N.; Sergienko, T.; Gustavsson, B.; Brändström, B. U. E.

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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Schlatter, N. M. / Ivchenko, N. / Sergienko, T. / et al: Enhanced EISCAT UHF backscatter during high-energy auroral electron precipitation. 2013. Copernicus Publications.

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