Academic article

• Sarria, David Alexandre Stephan; Østgaard, Nikolai; Bjørge-Engeland, Ingrid et al. (2025). Spectral Analysis of Flickering Gamma-Ray Flashes Observed During the ALOFT 2023 Campaign. (external link)
• Lang, Timothy J.; Østgaard, Nikolai; Marisaldi, Martino et al. (2025). Hunting for Gamma Rays above Thunderstorms: The ALOFT Campaign. (external link)
• Bjørge-Engeland, Ingrid; Østgaard, Nikolai; Sarria, David Alexandre Stephan et al. (2024). Evidence of a New Population of Weak Terrestrial Gamma-Ray Flashes Observed From Aircraft Altitude. (external link)
• Østgaard, Nikolai; Mezentsev, Andrey; Marisaldi, Martino et al. (2024). Flickering gamma-ray flashes, the missing link between gamma glows and TGFs. (external link)
• Marisaldi, Martino; Østgaard, Nikolai; Mezentsev, Andrey et al. (2024). Highly dynamic gamma-ray emissions are common in tropical thunderclouds. (external link)
• Bjørge-Engeland, Ingrid; Østgaard, Nikolai; Marisaldi, Martino et al. (2024). High Peak Current Lightning and the Production of Elves. (external link)
• Mezentsev, Andrey; Østgaard, Nikolai; Marisaldi, Martino et al. (2024). Discerning TGF and Leader Current Pulse in ASIM Observation. (external link)
• Nickolaenko, A.P.; Shvets, A.V.; Galuk, Yu.P. et al. (2023). Power flux in the Schumann resonance band linked to the eruption of Tonga volcano on Jan. 15, 2022. (Two point measurements of Umov-Poynting vector). (external link)
• Caballero-García, M.D.; Gupta, Rahul; Pandey, S.B. et al. (2023). Multiwavelength study of the luminous GRB 210619B observed with Fermi and ASIM. (external link)
• Sarria, David Alexandre Stephan; Østgaard, Nikolai; Marisaldi, Martino et al. (2023). Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations. (external link)
• Mezentsev, Andrey; Nickolaenko, A.P.; Shvets, A.V. et al. (2023). Observational and Model Impact of Tonga Volcano Eruption on Schumann Resonance. (external link)
• Bjørge-Engeland, Ingrid; Østgaard, Nikolai; Mezentsev, Andrey et al. (2022). Terrestrial Gamma-Ray Flashes With Accompanying Elves Detected by ASIM. (external link)
• Lindanger, Anders; Skeie, Chris Alexander Kallevik; Marisaldi, Martino et al. (2022). Production of Terrestrial Gamma-Ray Flashes During the Early Stages of Lightning Flashes. (external link)
• Skeie, Chris Alexander Kallevik; Østgaard, Nikolai; Mezentsev, Andrey et al. (2022). The Temporal Relationship Between Terrestrial Gamma-Ray Flashes and Associated Optical Pulses From Lightning. (external link)
• Castro-Tirado, A.J.; Østgaard, Nikolai; Göǧüş, E. et al. (2021). Very-high-frequency oscillations in the main peak of a magnetar giant flare. (external link)
• Sarria, David Alexandre Stephan; Østgaard, Nikolai; Kochkin, Pavlo et al. (2021). Constraining Spectral Models of a Terrestrial Gamma-Ray Flash From a Terrestrial Electron Beam Observation by the Atmosphere-Space Interactions Monitor. (external link)
• Kochkin, Pavlo; Sarria, David Alexandre Stephan; Lehtinen, Nikolai Grigorievich et al. (2021). A Rapid Gamma-Ray Glow Flux Reduction Observed From 20 km Altitude. (external link)
• Lindanger, Anders; Marisaldi, Martino; Sarria, David Alexandre Stephan et al. (2021). Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM. (external link)
• Østgaard, Nikolai; Cummer, S.A.; Mezentsev, Andrey et al. (2021). Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning. (external link)
• Maiorana, Carolina; Marisaldi, M.; Füllekrug, Martin et al. (2021). Observation of Terrestrial Gamma-Ray Flashes at Mid Latitude. (external link)
• Neubert, Torsten; Østgaard, Nikolai; Reglero, Victor et al. (2020). A terrestrial gamma-ray flash and ionospheric ultraviolet emissions powered by lightning. (external link)
• Østgaard, Nikolai; Neubert, Torsten; Reglero, Victor et al. (2019). First 10 Months of TGF Observations by ASIM. (external link)
• Füllekrug, Martin; Koh, Kuang; Liu, Zhongjian et al. (2019). First Map of Coherent Low-Frequency Continuum Radiation in the Sky. (external link)
• Sarria, David; Kochkin, Pavlo; Østgaard, Nikolai et al. (2019). The First Terrestrial Electron Beam Observed by the Atmosphere-Space Interactions Monitor. (external link)
• Østgaard, Nikolai; Christian, Hugh J.; Grove, J. Eric et al. (2019). Gamma Ray Glow Observations at 20-km Altitude. (external link)
• Liu, Zhongjian; Koh, Kuang Liang; Mezentsev, Andrey et al. (2018). Lightning Sferics: Analysis of the Instantaneous Phase and Frequency Inferred From Complex Waveforms. (external link)
• Füllekrug, Martin; Koh, Kuang; Liu, Zhongjian et al. (2018). Detection of Low-Frequency Continuum Radiation. (external link)
• Mezentsev, Andrey; Lehtinen, Nikolai; Østgaard, Nikolai et al. (2018). Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs. (external link)
• Skeltved, Alexander Broberg; Østgaard, Nikolai; Mezentsev, Andrey et al. (2017). Constraints to do realisticmodeling of the electric field ahead of the tip of a lightning leader. (external link)
• Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas et al. (2016). Radio emissions from double RHESSI TGFs. (external link)
• Füllekrug, Martin; Liu, Zhongjian; Koh, Kuang et al. (2016). Mapping lightning in the sky with a mini array. (external link)
• Liu, Zhongjian; Koh, Kuang Liang; Mezentsev, Andrey et al. (2016). Variable phase propagation velocity for long-range lightning location system. (external link)
• Østgaard, Nikolai; Carlson, Brant Edward; Nisi, Ragnhild Schrøder et al. (2016). Relativistic electrons from sparks in the laboratory. (external link)

Academic lecture

• Mezentsev, Andrey (2025). New Class of Gamma-Ray Flashes Indicate Gamma Glow Reset through Fast Streamer Discharge.. (external link)
• Sarria, David; Østgaard, Nikolai; Kochkin, Pavlo et al. (2019). The First Terrestrial Electron Beam Observed by the Atmosphere‐Space Interactions Monitor (ASIM), EGU 2019 Presentation.. (external link)
• Østgaard, Nikolai; Marisaldi, Martino; Albrechtsen, Kjetil et al. (2017). A Synergic Approach to the Study of TGFs and Energetic Radiation from Thunderstorms. (external link)

Poster

• Sarria, David; Kochkin, Pavlo; Østgaard, Nikolai et al. (2019). Observation of a Terrestrial Electron Beam during the tropical cyclone Joaninha in March 2019. (external link)
• Marisaldi, Martino; Østgaard, Nikolai; Albrechtsen, Kjetil et al. (2017). A Synergic Approach to the Study of TGFs and Energetic Radiation from Thunderstorms. (external link)
• Mezentsev, Andrey; Lehtinen, Nikolai; Østgaard, Nikolai et al. (2017). Spectral characteristics of VLF sferics associated with TGFs. (external link)
• Østgaard, Nikolai; Marisaldi, Martino; Kochkin, Pavlo et al. (2017). How should we define terrestrial gamma-ray flashes?. (external link)
• Skeltved, Alexander Broberg; Østgaard, Nikolai; Mezentsev, Andrey et al. (2017). Constraints to do realistic modeling of the electric field at the tip of a lightning leader. (external link)
• Østgaard, Nikolai; Christian, Hugh J.; Grove, Eric et al. (2017). Gamma-ray observations at 20 km altitude above thunderstorms. (external link)
• Mezentsev, Andrey; Lehtinen, Nikolai; Østgaard, Nikolai et al. (2016). Spectral characteristics of VLF sferics associated with TGFs. (external link)
• Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas et al. (2016). Radio emissions from RHESSI TGFs. (external link)
• Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas et al. (2016). Radio emissions from RHESSI TGFs. (external link)

Lecture

• Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas et al. (2016). Radio emissions from double RHESSI TGFs. (external link)

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