• Blue Flashes as Counterparts to Narrow Bipolar Events: The Optical Signal of Shallow In-Cloud Discharges 

      Li, Dongshuai; Luque, Alejandro; Gordillo-Vázquez, F.J.; Liu, Feifan; Lu, Gaopeng; Neubert, Torsten; Chanrion, Olivier; Zhu, Baoyou; Østgaard, Nikolai; Reglero, Víctor (Journal article; Peer reviewed, 2021)
      Narrow Bipolar Events (NBEs) are powerful radio emissions from thunderstorms, which have been recently associated with blue optical flashes on cloud tops and attributed to extensive streamer electrical discharges named ...
    • Characterization of Thunderstorm Cells Producing Observable Terrestrial Gamma-Ray Flashes 

      Husbjerg, Lasse Skaaning; Neubert, Torsten; Chanrion, Olivier; Marisaldi, Martino; Stendel, Martin; Kaas, Eigil; Østgaard, Nikolai; Reglero, Victor (Journal article; Peer reviewed, 2023)
      The meteorological conditions required for the production of Terrestrial Gamma-ray Flashes (TGFs) are not well understood. Particularly, the link between TGF production, meteorology, and weather severity is poorly characterized ...
    • Global Distribution of Key Features of Streamer Corona Discharges in Thunderclouds 

      Soler, S.; Gordillo-Vázquez, F.J.; Pérez-Invernón, F.J.; Luque, A.; Li, D.; Neubert, T.; Chanrion, O.; Reglero, V.; Navarro-González, J.; Østgaard, Nikolai (Journal article; Peer reviewed, 2022)
      We present nighttime worldwide distributions of key features of Blue LUminous Events (BLUEs) detected by the Modular Multispectral Imaging Array of the Atmosphere-Space Interaction Monitor. Around 10% of all detected BLUEs ...
    • Influence of Enhanced Planetary Wave Activity on the Polar Vortex Enhancement Related to Energetic Electron Precipitation 

      Asikainen, T.; Salminen, Antti; Maliniemi, Ville Aleksi; Mursula, K. (Journal article; Peer reviewed, 2020)
      The Northern polar vortex experiences considerable interannual variability, which is also reflected to tropospheric weather. Recent research has established a link between polar vortex variations and energetic electron ...
    • Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations 

      Sarria, David Alexandre Stephan; Østgaard, Nikolai; Marisaldi, Martino; Lehtinen, Nikolai Grigorievich; Mezentsev, Andrey (Journal article; Peer reviewed, 2023)
      Gamma-Ray Glows (GRGs) are high energy radiation originating from thunderclouds, in the MeV energy regime, with typical duration of seconds to minutes, and sources extended over several to tens of square kilometers. GRGs ...
    • Observation of Terrestrial Gamma-Ray Flashes at Mid Latitude 

      Maiorana, Carolina; Marisaldi, M.; Füllekrug, Martin; Soula, Serge; Lapierre, J.; Mezentsev, Andrey; Skeie, Chris Alexander Kallevik; Heumesser, M.; Chanrion, Olivier; Østgaard, N.; Neubert, Torsten; Reglero, Victor (Journal article; Peer reviewed, 2021)
      We present a sample of Terrestrial Gamma-ray Flashes (TGFs) observed at mid latitudes by the Atmosphere Space Interaction Monitor (ASIM). The events were detected between June 2018 and August 2020 in the latitude bands ...
    • On the High‐Energy Spectral Component and Fine Time Structure of Terrestrial Gamma Ray Flashes 

      Marisaldi, Martino; Galli, M.; Labanti, C.; Østgaard, Nikolai; Sarria, David; Cummer, S. A.; Lyu, F.; Lindanger, Anders; Campana, R.; Ursi, A.; Tavana, M; Fuschino, F.; Argan, A.; Trois, A.; Pittori, C.; Verrecchia, F (Journal article; Peer reviewed, 2019)
      Terrestrial gamma ray flashes (TGFs) are very short bursts of gamma radiation associated to thunderstorm activity and are the manifestation of the highest‐energy natural particle acceleration phenomena occurring on Earth. ...
    • A Rapid Gamma-Ray Glow Flux Reduction Observed From 20 km Altitude 

      Kochkin, Pavlo; Sarria, David Alexandre Stephan; Lehtinen, Nikolai Grigorievich; Mezentsev, Andrey; Yang, Shiming; Genov, Georgi; Ullaland, Kjetil; Marisaldi, Martino; Østgaard, Nikolai; Christian, Hugh J.; Grove, J.E.; Quick, M.; Al-Nussirat, S.; Wulf, E (Journal article; Peer reviewed, 2021)
      Two gamma-ray glows were observed by a high-altitude NASA ER-2 aircraft flying at 20 km altitude over a thunderstorm in Colorado, USA. The flux of the first glow rapidly intensified and then abruptly decreased within a few ...
    • A Simultaneous Observation of Lightning by ASIM, Colombia-Lightning Mapping Array, GLM, and ISS-LIS 

      Montanyà, Joan; López, Jesús A.; Morales Rodriguez, Carlos A.; van der Velde, Oscar A.; Fabró, Ferran; Pineda, Nicolau; Navarro-Gonzalez, Javier; Reglero, Victor; Neubert, Torsten; Chanrion, Olivier; Goodman, Steven J.; Østgaard, Nikolai; Ladino-Rincon, Alfonso; Romero, David; Solà, Glòria; Horta, Ricard; Freijó, Modesto (Journal article; Peer reviewed, 2021)
      The Atmosphere-Space Interactions Monitor (ASIM) on the International Space Station (ISS) provides optical radiances and images of lightning flashes in several spectral bands. This work presents a lightning flash simultaneously ...
    • Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning 

      Østgaard, Nikolai; Cummer, S.A.; Mezentsev, Andrey; Luque, Alejandro; Dwyer, J.; Neubert, Torsten; Reglero, Victor; Marisaldi, Martino; Kochkin, Pavlo; Sarria, David Alexandre Stephan; Lehtinen, Nikolai Grigorievich; Ullaland, Kjetil; Yang, Shiming; Genov, Georgi; Chanrion, Olivier; Christiansen, Freddy; Pu, Y. (Journal article; Peer reviewed, 2021)
      On February 8, 2019, the Atmosphere-Space Interaction Monitor observed a terrestrial gamma-ray flash (TGF) and an Elve from a positive intracloud (+IC) lightning during the initial breakdown stage of a lightning flash north ...
    • Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM 

      Lindanger, Anders; Marisaldi, Martino; Sarria, David Alexandre Stephan; Østgaard, Nikolai; Lehtinen, Nikolai Grigorievich; Skeie, Chris Alexander Kallevik; Mezentsev, Andrey; Kochkin, Pavlo; Ullaland, Kjetil; Yang, Shiming; Genov, Georgi; Carlson, Brant Edward; Köhn, Christoph; Navarro-Gonzalez, Javier; Connell, Paul H.; Reglero, Victor; Neubert, Torsten (Journal article; Peer reviewed, 2021)
      The Atmosphere-Space Interactions Monitor (ASIM) is the first instrument in space specifically designed to observe terrestrial gamma-ray flashes (TGFs). TGFs are high energy photons associated with lightning flashes and ...
    • The Temporal Relationship Between Terrestrial Gamma-Ray Flashes and Associated Optical Pulses From Lightning 

      Skeie, Chris Alexander Kallevik; Østgaard, Nikolai; Mezentsev, Andrey; Bjørge-Engeland, Ingrid; Marisaldi, Martino; Lehtinen, Nikolai Grigorievich; Reglero, V.; Neubert, T. (Journal article; Peer reviewed, 2022)
      We present 221 Terrestrial Gamma-ray Flashes (TGFs) and associated optical pulses observed by the Atmosphere-Space Interactions Monitor (ASIM) on board the International Space Station. The events were detected between the ...
    • Terrestrial Gamma-Ray Flashes With Accompanying Elves Detected by ASIM 

      Bjørge-Engeland, Ingrid; Østgaard, Nikolai; Mezentsev, Andrey; Skeie, Chris Alexander Kallevik; Sarria, David Alexandre Stephan; Lapierre, Jeff; Lindanger, Anders; Neubert, Torsten; Marisaldi, Martino; Lehtinen, Nikolai Grigorievich; Chanrion, Olivier; Ullaland, Kjetil; Yang, Shiming; Genov, Georgi; Christiansen, Freddy; Reglero, Victor (Journal article; Peer reviewed, 2022)
      The Atmosphere-Space Interactions Monitor was designed to monitor Terrestrial Gamma-ray Flashes (TGFs) and Transient Luminous Events (TLEs) from space, enabling the study of how these phenomena are related. In this paper, ...