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1.
  • Ivchenko, Nickolay V., et al. (author)
  • Observation of O+4P-D-4(0) lines in proton aurora over Svalbard
  • 2004
  • In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 31:10
  • Journal article (peer-reviewed)abstract
    • Spectra of a proton aurora event show lines of O+ P-4-D-4(0) multiplet (4639-4696 Angstrom) enhanced relative to the N(2)(+)1N(0,2) compared to normal electron aurora. Conjugate satellite particle measurements are used as input to electron and proton transport models, to show that p/H precipitation is the dominant source of both the O+ and N(2)(+)1N emissions. The emission cross-section of the multiplet in p collisions with O and O-2 estimated from published work does not explain the observed O+ brightness, suggesting a higher emission cross-section for low energy p impact on O.
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2.
  • Ivchenko, Nickolay V., et al. (author)
  • Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard
  • 2004
  • In: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 22:8, s. 2805-2817
  • Journal article (peer-reviewed)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(H-beta, N-2(+) 1N(0,2) and N-2(+) 1N(1,3)). The oxygen ion P-4-D-4(0) multiplet (4639-4696 Angstrom) 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 x 10(-18) cm(2).
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Lanchester, B. S. (2)
Lummerzheim, D. (2)
Ivchenko, Nickolay V ... (2)
Galand, M. (2)
Rees, M. H. (2)
Furniss, I. (2)
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Fordham, J (1)
Throp, K. (1)
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University
Royal Institute of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2004 (2)Undo refine

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