Browsing NTNU Open by Author "Demissie, Teferi Dejene"

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    • Characteristics and sources of gravity waves observed in noctilucent cloud over Norway 

      Demissie, Teferi Dejene; Espy, Patrick Joseph; Stray, Nora Henriette; Hatlen, Morten; Kaifler, Natalie; Baumgarten, G (Journal article; Peer reviewed, 2014)
      Four years of noctilucent cloud (NLC) images from an automated digital camera in Trondheim and results from a ray-tracing model are used to extend the climatology of gravity waves to higher latitudes and to identify ...

    • Quasi-16-day period oscillations observed in middle atmospheric ozone and temperature in Antarctica 

      Demissie, Teferi Dejene; Kleinknecht, Nora; Hibbins, Robert; Espy, Patrick Joseph; Straub, Corinne (Journal article; Peer reviewed, 2013)
      Nightly averaged mesospheric temperature derived from the hydroxyl nightglow at Rothera station (67°34' S, 68°08' W) and nightly midnight measurements of ozone mixing ratio obtained from Troll station (72°01' S, 2°32' E) ...

    • Results from the intercalibration of optical low-light calibration sources 2011 

      Brändström, B. Urban E.; Enell, Carl-Fredrik; Widell, Ola; Hansson, Thord; Whiter, Daniel; Mäkinen, Sanna; Mikhaylova, Daria; Axelsson, Katarina; Sigernes, Fred; Gulbrandsen, Njål; Schlatter, Nicola M.; Gjendem, Amund Gjerde; Cai, L.; Reistad, Jone Peter; Daae, Marianne; Demissie, Teferi Dejene; Andalsvik, Yngvild Linnea; Roberts, Owen; Poluyanov, Stepan Viktorovich; Chernouss, Sergey (Journal article; Peer reviewed, 2011)
      Following the 38th Annual European Meeting on Atmospheric Studies by Optical Methods in Siuntio in Finland, an intercalibration workshop for optical low light calibration sources was held in Sodankyla, Finland. The main ¨ ...

    • The vertical structure and source regions of large and small scale waves in the middle atmosphere 

      Demissie, Teferi Dejene (Doktoravhandlinger ved NTNU, 1503-8181; 2013:272, Doctoral thesis, 2013)
      Atmospheric waves are periodic oscillations of the atmospheric variables such as density and temperature, which can have spatial sizes from a few kilometer to thousands of kilometers, and temporal variations from days to ...