Observation of O+ (4P-4D0) lines in electron aurora over Svalbard
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, N+2 1N(0,2) and N+2 1N(1,3)). The oxygen ion 4P-4D0 multiplet (4639–4696 A° ) is blended with the N+2 1N(1,3) band. It is foun...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:9535 2023-05-15T18:29:41+02:00 Observation of O+ (4P-4D0) lines in electron aurora over Svalbard Ivchenko, N. Rees, M. Lanchester, B. Lummerzheim, D. Galand, M. Throp, K. Furniss, I. 2004-08 http://discovery.ucl.ac.uk/9535/ eng eng open gold Annales Geophysicae , 22 (8) pp. 2805-2817. (2004) Article 2004 ftucl 2013-11-09T21:00:49Z 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, N+2 1N(0,2) and N+2 1N(1,3)). The oxygen ion 4P-4D0 multiplet (4639–4696 A° ) 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. Article in Journal/Newspaper Svalbard University College London: UCL Discovery Norway Svalbard |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
description |
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, N+2 1N(0,2) and N+2 1N(1,3)). The oxygen ion 4P-4D0 multiplet (4639–4696 A° ) 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. |
format |
Article in Journal/Newspaper |
author |
Ivchenko, N. Rees, M. Lanchester, B. Lummerzheim, D. Galand, M. Throp, K. Furniss, I. |
spellingShingle |
Ivchenko, N. Rees, M. Lanchester, B. Lummerzheim, D. Galand, M. Throp, K. Furniss, I. Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
author_facet |
Ivchenko, N. Rees, M. Lanchester, B. Lummerzheim, D. Galand, M. Throp, K. Furniss, I. |
author_sort |
Ivchenko, N. |
title |
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
title_short |
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
title_full |
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
title_fullStr |
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
title_full_unstemmed |
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard |
title_sort |
observation of o+ (4p-4d0) lines in electron aurora over svalbard |
publishDate |
2004 |
url |
http://discovery.ucl.ac.uk/9535/ |
geographic |
Norway Svalbard |
geographic_facet |
Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Annales Geophysicae , 22 (8) pp. 2805-2817. (2004) |
op_rights |
open gold |
_version_ |
1766212955627585536 |