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Enhanced EISCAT UHF backscatter during high-energy auroral electron precipitation

By Nicola M. Schlatter, Nickolay Ivchenko, T Sergienko, Björn Johan Gustavsson and B. U. E. Brändström

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

Topics: VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437
Publisher: Copernicus
Year: 2013
DOI identifier: 10.5194/angeo-31-1681-2013
OAI identifier: oai:www.ub.uit.no:10037/6045
Journal:

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