• Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges 

      Skeie, Chris Alexander; Østgaard, Nikolai; Lehtinen, Nikolai; Sarria, David; Kochkin, Pavlo; de Boer, Boer; Bardet, M.; Allasia, C.; Flourens, F. (Journal article; Peer reviewed, 2020)
      During Airbus aircraft campaigns flying into thunderstorms in 2014–2016, X-rays were observed during two stages of aircraft-triggered lightning: nanosecond pulses of X-rays associated with negative leader steps and bursts ...
    • In‐Flight Observation of Positron Annihilation by ILDAS 

      Kochkin, Pavlo; Sarria, David; Skeie, Chris Alexander; Van Deursen, Alexander P.J.; de Boer, A; Bardet, Michiel; Allasia, Cedric; Flourens, Franck; Østgaard, Nikolai (Peer reviewed; Journal article, 2018-08)
      We report a 511‐keV photon flux enhancement that was observed inside a thundercloud and is a result of positron annihilation. The observation was made with the In‐flight Lightning Damage Assessment System (ILDAS) on board ...