Modelling N21P contamination in auroral O+ emissions
Modelling N21P contamination in auroral O+ emissions
Modelling of N21P (5,3) contamination at the O+ doublet emissions in the region of 732 nm is presented. The method is derived from a known relationship between emission from the N21P (5,3) band and emissions from the N21P (5,2), (4,1) and (3,0) bands. A synthetic molecular spectrum is used to quantify a temperature-dependent emission ratio of these band systems as a function of filter characteristics and emission altitude. Five optical observations of high-energy auroral periods on 9 January 2008 are compared with results from the synthetic spectrum. Two cameras from a high sensitivity, high frame rate (20 Hz) ground based imager in combination with a co-located high resolution spectrograph are used to identify events which are dominated by molecular nitrogen emissions. There is good agreement between the observed and modelled ratios. The temperatures associated with these ratios agree well with temperature profiles extracted from fitting the synthetic spectra to the spectrograph data. A synthetic spectrum is important for future work when the removal of N21P (5,3) contamination from O+ (2P) doublet emissions is required at high temporal resolution.
oxygen ion doublet 732 nm, aurora, molecular nitrogen spectra, contamination
8-11
Spry, J.D.
60bec323-5ff1-4807-b38a-7fb25109b61d
Jokiaho, O.
b0c1ece4-c37b-424e-b288-1369c8e221d2
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
January 2014
Spry, J.D.
60bec323-5ff1-4807-b38a-7fb25109b61d
Jokiaho, O.
b0c1ece4-c37b-424e-b288-1369c8e221d2
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Spry, J.D., Jokiaho, O., Lanchester, B.S. and Whiter, D.K.
(2014)
Modelling N21P contamination in auroral O+ emissions.
Journal of Atmospheric and Solar-Terrestrial Physics, 107, .
(doi:10.1016/j.jastp.2013.10.013).
Abstract
Modelling of N21P (5,3) contamination at the O+ doublet emissions in the region of 732 nm is presented. The method is derived from a known relationship between emission from the N21P (5,3) band and emissions from the N21P (5,2), (4,1) and (3,0) bands. A synthetic molecular spectrum is used to quantify a temperature-dependent emission ratio of these band systems as a function of filter characteristics and emission altitude. Five optical observations of high-energy auroral periods on 9 January 2008 are compared with results from the synthetic spectrum. Two cameras from a high sensitivity, high frame rate (20 Hz) ground based imager in combination with a co-located high resolution spectrograph are used to identify events which are dominated by molecular nitrogen emissions. There is good agreement between the observed and modelled ratios. The temperatures associated with these ratios agree well with temperature profiles extracted from fitting the synthetic spectra to the spectrograph data. A synthetic spectrum is important for future work when the removal of N21P (5,3) contamination from O+ (2P) doublet emissions is required at high temporal resolution.
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More information
Accepted/In Press date: 24 October 2013
e-pub ahead of print date: 1 November 2013
Published date: January 2014
Keywords:
oxygen ion doublet 732 nm, aurora, molecular nitrogen spectra, contamination
Organisations:
Physics & Astronomy
Identifiers
Local EPrints ID: 368017
URI: http://eprints.soton.ac.uk/id/eprint/368017
ISSN: 1364-6826
PURE UUID: 2bdfbac2-07e1-4b11-8fdc-41d3c4f33f98
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Date deposited: 13 Aug 2014 13:26
Last modified: 15 Mar 2024 03:31
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Contributors
Author:
J.D. Spry
Author:
O. Jokiaho
Author:
B.S. Lanchester
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