Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions
We have developed a spectral fitting method to retrieve upper atmospheric parameters at multiple altitudes simultaneously during times of aurora, allowing us to measure neutral temperatures and column densities of water vapour. We use the method to separate airglow OH emissions from auroral O + and...
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ftdoajarticles:oai:doaj.org/article:53ab461369bc43a296afe11405a9746e 2023-05-15T18:29:48+02:00 Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions J. M. Chadney D. K. Whiter 2018-11-01T00:00:00Z https://doi.org/10.5194/gi-7-317-2018 https://doaj.org/article/53ab461369bc43a296afe11405a9746e EN eng Copernicus Publications https://www.geosci-instrum-method-data-syst.net/7/317/2018/gi-7-317-2018.pdf https://doaj.org/toc/2193-0856 https://doaj.org/toc/2193-0864 doi:10.5194/gi-7-317-2018 2193-0856 2193-0864 https://doaj.org/article/53ab461369bc43a296afe11405a9746e Geoscientific Instrumentation, Methods and Data Systems, Vol 7, Pp 317-329 (2018) Geophysics. Cosmic physics QC801-809 article 2018 ftdoajarticles https://doi.org/10.5194/gi-7-317-2018 2022-12-31T04:11:59Z We have developed a spectral fitting method to retrieve upper atmospheric parameters at multiple altitudes simultaneously during times of aurora, allowing us to measure neutral temperatures and column densities of water vapour. We use the method to separate airglow OH emissions from auroral O + and N 2 in observations between 725 and 740 nm using the High Throughput Imaging Echelle Spectrograph (HiTIES) located on Svalbard. In this paper, we describe our new method and show the results of Monte Carlo simulations using synthetic spectra which demonstrate the validity of the spectral fitting method and provide an indication of uncertainties on the retrieval of each atmospheric parameter. We show that the method allows for the retrieval of OH temperatures with an uncertainty of 6 % when contamination by N 2 emission is small. N 2 temperatures can be retrieved with uncertainties down to 3 %–5 % when N 2 emission intensity is high. We can determine the intensity ratio between the O + doublets at 732 and 733 nm (which is a function of temperature) with an uncertainty of 5 %. Article in Journal/Newspaper Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Doublets ENVELOPE(98.667,98.667,-66.417,-66.417) Geoscientific Instrumentation, Methods and Data Systems 7 4 317 329 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Geophysics. Cosmic physics QC801-809 J. M. Chadney D. K. Whiter Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
topic_facet |
Geophysics. Cosmic physics QC801-809 |
description |
We have developed a spectral fitting method to retrieve upper atmospheric parameters at multiple altitudes simultaneously during times of aurora, allowing us to measure neutral temperatures and column densities of water vapour. We use the method to separate airglow OH emissions from auroral O + and N 2 in observations between 725 and 740 nm using the High Throughput Imaging Echelle Spectrograph (HiTIES) located on Svalbard. In this paper, we describe our new method and show the results of Monte Carlo simulations using synthetic spectra which demonstrate the validity of the spectral fitting method and provide an indication of uncertainties on the retrieval of each atmospheric parameter. We show that the method allows for the retrieval of OH temperatures with an uncertainty of 6 % when contamination by N 2 emission is small. N 2 temperatures can be retrieved with uncertainties down to 3 %–5 % when N 2 emission intensity is high. We can determine the intensity ratio between the O + doublets at 732 and 733 nm (which is a function of temperature) with an uncertainty of 5 %. |
format |
Article in Journal/Newspaper |
author |
J. M. Chadney D. K. Whiter |
author_facet |
J. M. Chadney D. K. Whiter |
author_sort |
J. M. Chadney |
title |
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
title_short |
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
title_full |
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
title_fullStr |
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
title_full_unstemmed |
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
title_sort |
neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/gi-7-317-2018 https://doaj.org/article/53ab461369bc43a296afe11405a9746e |
long_lat |
ENVELOPE(98.667,98.667,-66.417,-66.417) |
geographic |
Svalbard Doublets |
geographic_facet |
Svalbard Doublets |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Geoscientific Instrumentation, Methods and Data Systems, Vol 7, Pp 317-329 (2018) |
op_relation |
https://www.geosci-instrum-method-data-syst.net/7/317/2018/gi-7-317-2018.pdf https://doaj.org/toc/2193-0856 https://doaj.org/toc/2193-0864 doi:10.5194/gi-7-317-2018 2193-0856 2193-0864 https://doaj.org/article/53ab461369bc43a296afe11405a9746e |
op_doi |
https://doi.org/10.5194/gi-7-317-2018 |
container_title |
Geoscientific Instrumentation, Methods and Data Systems |
container_volume |
7 |
container_issue |
4 |
container_start_page |
317 |
op_container_end_page |
329 |
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1766213191824572416 |