@article{Ivchenko:2004,
author = {Ivchenko, N and Rees, MH and Lanchester, BS and Lummerzheim, D and Galand, M and Throp, K and Furniss, I},
journal = {Annales Geophysicae},
pages = {2805--2817},
title = {Observation of O<sup>+</sup> (<sup>4</sup>P-<sup>4</sup>D<sup>0</sup>) lines in electron aurora over Svalbard},
volume = {22},
year = {2004}
}

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TY  - JOUR
AB  - This work reports on observations of 0+ lines in aurora over Svalbard, Norway. The Spectrographic Imaging Facility measures auroral spectra in three wavelength intervals (Hβ, N+2 1N(0,2) and N+2 1N(1,3) . The oxygen ion 4P-4D0 multiplet (4639-4696 Å) is blended with the N+2 1N(1,3 band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0. 1 of the N+2 1N(0,2) total brightness. A joint optical and incoherent scatter radar study of an electron aurora event shows that the ratio is enhanced when the ionisation in the upper E-layer (140-190 km) is significant with respect to the E-layer peak below 130 km. Rayed arcs were observed on one such occasion, whereas on other occasions the auroral intensity was below the threshold of the imager. A one-dimensional electron transport model is used to estimate the cross section for production of the multiplet in electron collisions, yielding 0. 18 × 10-18 cm2. © European Geosciences Union 2004.
AU  - Ivchenko,N
AU  - Rees,MH
AU  - Lanchester,BS
AU  - Lummerzheim,D
AU  - Galand,M
AU  - Throp,K
AU  - Furniss,I
EP  - 2817
PY  - 2004///
SN  - 0992-7689
SP  - 2805
TI  - Observation of O<sup>+</sup> (<sup>4</sup>P-<sup>4</sup>D<sup>0</sup>) lines in electron aurora over Svalbard
T2  - Annales Geophysicae
VL  - 22
ER  - 

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