Blar i Department of Physics and Technology på forfatter "Sandanger, Marit Irene"

Viser treff 1-6 av 6

    • Direct and indirect electron precipitation effect on nitric oxide in the polar middle atmosphere, using a full-range energy spectrum 

      Smith-Johnsen, Christine; Tyssøy, Hilde Nesse; Hendrickx, Koen; Orsolini, Yvan; Kishore Kumar, Grandhi; Ødegaard, Linn-Kristine Glesnes; Sandanger, Marit Irene; Stordal, Frode; Megner, Linda (Peer reviewed; Journal article, 2017)
      In April 2010, a coronal mass ejection and a corotating interaction region on the Sun resulted in an energetic electron precipitation event in the Earth’s atmosphere. We investigate direct and indirect nitric oxide (NO) ...

    • Energetic electron precipitation in weak to moderate corotating interaction region-driven storms 

      Ødegaard, Linn-Kristine Glesnes; Tyssøy, Hilde Nesse; Søraas, Finn; Stadnes, Johan; Sandanger, Marit Irene (Peer reviewed; Journal article, 2017-03)
      High-energy electron precipitation from the radiation belts can penetrate deep into the mesosphere and increase the production rate of NOx and HOx, which in turn will reduce ozone in catalytic processes. The mechanisms for ...

    • Energetic Electron Precipitation into the Middle Atmosphere – Constructing the Loss Cone Fluxes from MEPED POES 

      Tyssøy, Hilde Nesse; Sandanger, Marit Irene; Stadsnes, Johan; Zawedde, Annet Eva; Ødegaard, Linn-Kristine Glesnes; Åsnes, Arne (Peer reviewed; Journal article, 2016-06)
      The impact of energetic electron precipitation (EEP) on the chemistry of the middle atmosphere (50–90 km) is still an outstanding question as accurate quantification of EEP is lacking due to instrumental challenges and ...

    • 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 ...

    • In-flight calibration of NOAA POES proton detectors - Derivation of the MEPED correction factors 

      Sandanger, Marit Irene; Ødegaard, Linn-Kristine Glesnes; Tyssøy, Hilde Nesse; Stadsnes, Johan; Søraas, Finn; Oksavik, Kjellmar; Aarsnes, Kjell (Peer reviewed; Journal article, 2015-11-25)
      The MEPED instruments on board the NOAA POES and MetOp satellites have been continuously measuring energetic particles in the magnetosphere since 1978. However, degradation of the proton detectors over time leads to an ...

    • Space Weather impact on the degradation of NOAA POES MEPED proton detectors 

      Ødegaard, Linn-Kristine Glesnes; Tyssøy, Hilde Nesse; Sandanger, Marit Irene; Stadsnes, Johan; Søraas, Finn (Peer reviewed; Journal article, 2016-06-07)
      The Medium Energy Proton and Electron Detector (MEPED) on board the National Oceanic and Atmospheric Administration Polar Orbiting Environmental Satellites (NOAA POES) is known to degrade with time. In recent years a lot ...