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This work reports on observations of O+ lines in aurora overSvalbard, Norway. The Spectrographic Imaging Facility measures auroralspectra in three wavelength intervals(Hβ, N+2 1N(0,2) and N+2 1N(1,3)).The oxygen ion multiplet (4639-4696\uc5) is blendedwith the band.It is found that in electron aurora, the brightnessof this multiplet, ison average, about 0.1 of the total brightness.A joint optical and incoherent scatter radar study of anelectron aurora event shows that the ratio is enhancedwhen the ionisation in the upper E-layer (140-190km)is significant with respect to the E-layer peakbelow 130km. Rayed arcs were observed on one suchoccasion, whereas on other occasions the auroralintensity was below the threshold of the imager.A one-dimensional electron transport model is used toestimate the cross section for production of the multipletin electron collisions, yielding 0.18x10-18cm2

annales geophysicae

Observation of O&amp;lt;sup&amp;gt;+&amp;lt;/sup&amp;gt; (&amp;lt;sup&amp;gt;4&amp;lt;/sup&amp;gt;P-&amp;lt;sup&amp;gt;4&amp;lt;/sup&amp;gt;D&amp;lt;sup&amp;gt;0&amp;lt;/sup&amp;gt;) lines in electron aurora over Svalbard