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Observation of O+ (...
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard
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- Ivchenko, Nickolay V. (författare)
- KTH,Alfvénlaboratoriet,University of Southampton, United Kingdom
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Rees, M. H. (författare)
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Lanchester, B. S. (författare)
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Lummerzheim, D. (författare)
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Galand, M. (författare)
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Throp, K. (författare)
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Furniss, I. (författare)
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(creator_code:org_t)
- 2004-09-07
- 2004
- Engelska.
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Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 22:8, s. 2805-2817
- Relaterad länk:
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https://www.ann-geop...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- 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).
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- meteorology and atmospheric dynamics
- airglow and aurora
- ionosphere
- particle precipitation
- field-aligned currents
- optical aurora
- spectra
- oxygen
- radar
- impact
- excitation
- emissions
- scatter
- n2
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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