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Discussion papers | Copyright
https://doi.org/10.5194/gi-2018-19
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jul 2018

Research article | 30 Jul 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Instrumentation, Methods and Data Systems (GI).

Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions

Joshua M. Chadney and Daniel K. Whiter Joshua M. Chadney and Daniel K. Whiter
  • Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK

Abstract. 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 N2 in observations between 725–740nm 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 as well as provide an indication of uncertainties on the retrieval of each atmospheric parameter.

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Joshua M. Chadney and Daniel K. Whiter
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Joshua M. Chadney and Daniel K. Whiter
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Short summary
We measure spectra of upper atmospheric emissions in optical wavelengths using the High Throughput Imaging Echelle Spectrograph (HiTIES), located on Svalbard. These spectra contain superposed emissions originating from different altitudes. In this paper, we describe a fitting method which allows us to separate the measured emissions, thus allowing us to measure neutral temperatures at different altitudes, as well as the density of water vapour in the atmosphere above the instrument.
We measure spectra of upper atmospheric emissions in optical wavelengths using the High...
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