Observation of O+ (P-4-D-4(0)) 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-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...
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2004
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ftucl:oai:eprints.ucl.ac.uk.OAI2:35955 2023-05-15T18:29:42+02:00 Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard Ivchenko, N Rees, MH Lanchester, BS Lummerzheim, D Galand, M Throp, K Furniss, I 2004-09-07 http://discovery.ucl.ac.uk/35955/ eng eng EUROPEAN GEOSCIENCES UNION open Annales Geophysica , 22 (8) 2805 - 2817. (2004) Meteorology and atmospheric dynamics Airglow and aurora Ionosphere Particle precipitation Field-aligned currents Optical aurora Spectra Oxygen Radar Impact Excitation Emissions Scatter N2 Article 2004 ftucl 2017-03-23T23:10:11Z 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). 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 |
topic |
Meteorology and atmospheric dynamics Airglow and aurora Ionosphere Particle precipitation Field-aligned currents Optical aurora Spectra Oxygen Radar Impact Excitation Emissions Scatter N2 |
spellingShingle |
Meteorology and atmospheric dynamics Airglow and aurora Ionosphere Particle precipitation Field-aligned currents Optical aurora Spectra Oxygen Radar Impact Excitation Emissions Scatter N2 Ivchenko, N Rees, MH Lanchester, BS Lummerzheim, D Galand, M Throp, K Furniss, I Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
topic_facet |
Meteorology and atmospheric dynamics Airglow and aurora Ionosphere Particle precipitation Field-aligned currents Optical aurora Spectra Oxygen Radar Impact Excitation Emissions Scatter N2 |
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-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). |
format |
Article in Journal/Newspaper |
author |
Ivchenko, N Rees, MH Lanchester, BS Lummerzheim, D Galand, M Throp, K Furniss, I |
author_facet |
Ivchenko, N Rees, MH Lanchester, BS Lummerzheim, D Galand, M Throp, K Furniss, I |
author_sort |
Ivchenko, N |
title |
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
title_short |
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
title_full |
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
title_fullStr |
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
title_full_unstemmed |
Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard |
title_sort |
observation of o+ (p-4-d-4(0)) lines in electron aurora over svalbard |
publisher |
EUROPEAN GEOSCIENCES UNION |
publishDate |
2004 |
url |
http://discovery.ucl.ac.uk/35955/ |
geographic |
Norway Svalbard |
geographic_facet |
Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Annales Geophysica , 22 (8) 2805 - 2817. (2004) |
op_rights |
open |
_version_ |
1766213018315653120 |