The University of Southampton
University of Southampton Institutional Repository

Spectral modelling of molecular nitrogen in Aurora

Record type: Thesis (Doctoral)

A custom made five panel filter mosaic window was designed, installed and operated
with the HiTIES (High Throughput Imaging Echelle Spectrograph) at the Nordlysstasjonen in Svalbard, Norway (78.2025N and 15.829E). The filter provides
images of the resonant scattered spectra of N+
2 1N (0,1), (1,2), (2,3) bands and a neutral
N2 2P (0,3) band. Ab initio models were created for describing the populations of vibrational and rotational energy levels in both excited and ionised N2 molecules in
the ionosphere. In the rotational profiles the species are treated to be in thermal equilibrium, whereas the vibrational levels assume a non-thermal steady state time
independent model.

Rotational temperatures were evaluated for different auroral forms for the N+ 2 (0,2)
band from the magnetic zenith and along the meridian slit in HiTIES data from winter. A clear trend in neutral temperature is found, with higher values for times of lower
energy precipitation. The relationship between resonant scattering of solar photons via N+ 2 and direct emission from electron impact on N2 was evaluated qualitatively and
quantitatively with HiTIES data from January-March 2007. A relationship was found that clearly indicates the emission profiles are a function of primary electron energy
and solar shadow height when auroral arcs are partially sunlit during events of electron precipitation.

PDF Jokiaho_PhD_thesis.pdf - Other
Download (14MB)

Citation

Jokiaho, Olli-Pekka (2009) Spectral modelling of molecular nitrogen in Aurora University of Southampton, School of Physics and Astronomy, Doctoral Thesis , 142pp.

More information

Published date: September 2009
Organisations: University of Southampton

Identifiers

Local EPrints ID: 161195
URI: http://eprints.soton.ac.uk/id/eprint/161195
PURE UUID: f60b1ba5-74dd-4695-ba2b-cd659c24bb9a

Catalogue record

Date deposited: 30 Jul 2010 16:01
Last modified: 18 Jul 2017 12:34

Export record

Contributors

Author: Olli-Pekka Jokiaho
Thesis advisor: Betty Lanchester

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×