• The impact of energetic electron precipitation on mesospheric hydroxyl during a year of solar minimum 

      Zawedde, Annet Eva; Tyssøy, Hilde Nesse; Hibbins, Robert Edward; Espy, Patrick Joseph; Degaard, L-K.; Sandanger, Marit Irene; Stadsnes, Johan (Peer reviewed; Journal article, 2016-06)
      In 2008 a sequence of geomagnetic storms occurred triggered by high-speed solar wind streams from coronal holes. Improved estimates of precipitating fluxes of energetic electrons are derived from measurements on board the ...
    • Modelling the descent of nitric oxide during the elevated stratopause event of January 2013 

      Orsolini, Yvan; Limpasuvan, Varavut; Pérot, Kristell; Espy, Patrick Joseph; Hibbins, Robert; Lossow, Stefan; Raaholt Larsson, Katarina; Murtagh, Donal (Peer reviewed; Journal article, 2017-03)
      Using simulations with a whole-atmosphere chemistry-climate model nudged by meteorological analyses, global satellite observations of nitrogen oxide (NO) and water vapour by the Sub-Millimetre Radiometer instrument (SMR), ...
    • Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events 

      Stray, Nora Henriette; Orsolini, Yvan; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Peer reviewed; Journal article, 2015-05-04)
      This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain ...
    • Optimizing hydroxyl airglow retrievals from long-slit astronomical spectroscopic observations 

      Franzen, Christoph; Hibbins, Robert; Espy, Patrick Joseph; Djupvik, Anlaug Amanda (Peer reviewed; Journal article, 2017-08-25)
      Astronomical spectroscopic observations from ground-based telescopes contain background emission lines from the terrestrial atmosphere's airglow. In the near infrared, this background is composed mainly of emission from ...