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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 8
Ann. Geophys., 22, 2805–2817, 2004
https://doi.org/10.5194/angeo-22-2805-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 2805–2817, 2004
https://doi.org/10.5194/angeo-22-2805-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  07 Sep 2004

07 Sep 2004

Observation of O+ (4P-4D0) lines in electron aurora over Svalbard

N. Ivchenko2,1, M. H. Rees1, B. S. Lanchester1, D. Lummerzheim3, M. Galand4, K. Throp1, and I. Furniss5 N. Ivchenko et al.
  • 1School of Physics and Astronomy, University of Southampton, UK
  • 2Alfvén Laboratory, KTH, Stockholm, Sweden
  • 3Geophysical Institute, University of Alaska, Fairbanks, USA
  • 4Center for Space Physics, Boston University, Boston, Massachusetts, USA
  • 5Atmospheric Physics Laboratory, University College London, UK

Abstract. This work reports on observations of O+ 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 multiplet (4639-4696Å) is blended with the band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0.1 of the 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 (140-190km) is significant with respect to the E-layer peak below 130km. 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 0.18x10-18cm2.

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