Academic article

• David Alexandre Stephan Sarria; Nikolai Østgaard; Ingrid Bjørge-Engeland et al. (2025). Spectral Analysis of Flickering Gamma-Ray Flashes Observed During the ALOFT 2023 Campaign. (external link)
• Nikolai Østgaard; Andrey Mezentsev; Martino Marisaldi et al. (2024). Flickering gamma-ray flashes, the missing link between gamma glows and TGFs. (external link)
• Anders Lindanger; Martino Marisaldi; David Alexandre Stephan Sarria et al. (2021). Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM. (external link)
• A.J. Castro-Tirado; Nikolai Østgaard; E. Göǧüş et al. (2021). Very-high-frequency oscillations in the main peak of a magnetar giant flare. (external link)
• Martin Füllekrug; Kuang Koh; Zhongjian Liu et al. (2018). Detection of Low-Frequency Continuum Radiation. (external link)
• A.P. Nickolaenko; A.V. Shvets; Yu.P. Galuk 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)
• Torsten Neubert; Nikolai Østgaard; Victor Reglero et al. (2020). A terrestrial gamma-ray flash and ionospheric ultraviolet emissions powered by lightning. (external link)
• Andrey Mezentsev; A.P. Nickolaenko; A.V. Shvets et al. (2023). Observational and Model Impact of Tonga Volcano Eruption on Schumann Resonance. (external link)
• Øystein Håvard Færder; Nikolai Grigorievich Lehtinen; D. Sarria et al. (2026). Numerical Parameter‐Space Studies of Various Types of Thundercloud Gamma‐Ray Emissions. (external link)
• Martin Füllekrug; Kuang Koh; Zhongjian Liu et al. (2019). First Map of Coherent Low-Frequency Continuum Radiation in the Sky. (external link)
• Zhongjian Liu; Kuang Liang Koh; Andrey Mezentsev et al. (2018). Lightning Sferics: Analysis of the Instantaneous Phase and Frequency Inferred From Complex Waveforms. (external link)
• David Alexandre Stephan Sarria; Nikolai Østgaard; Pavlo Kochkin 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)
• Martin Füllekrug; Zhongjian Liu; Kuang Koh et al. (2016). Mapping lightning in the sky with a mini array. (external link)
• Nikolai Østgaard; S.A. Cummer; Andrey Mezentsev et al. (2021). Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning. (external link)
• Alexander Broberg Skeltved; Nikolai Østgaard; Andrey Mezentsev et al. (2017). Constraints to do realisticmodeling of the electric field ahead of the tip of a lightning leader. (external link)
• Timothy J. Lang; Nikolai Østgaard; Martino Marisaldi et al. (2025). Hunting for Gamma Rays above Thunderstorms: The ALOFT Campaign. (external link)
• Nikolai Østgaard; Torsten Neubert; Victor Reglero et al. (2019). First 10 Months of TGF Observations by ASIM. (external link)
• Andrey Mezentsev; Nikolai Østgaard; Thomas Gjesteland et al. (2016). Radio emissions from double RHESSI TGFs. (external link)
• Ingrid Bjørge-Engeland; Nikolai Østgaard; Andrey Mezentsev et al. (2022). Terrestrial Gamma-Ray Flashes With Accompanying Elves Detected by ASIM. (external link)
• Ingrid Bjørge-Engeland; Nikolai Østgaard; David Alexandre Stephan Sarria et al. (2024). Evidence of a New Population of Weak Terrestrial Gamma-Ray Flashes Observed From Aircraft Altitude. (external link)
• David Sarria; Pavlo Kochkin; Nikolai Østgaard et al. (2019). The First Terrestrial Electron Beam Observed by the Atmosphere-Space Interactions Monitor. (external link)
• M.D. Caballero-García; Rahul Gupta; S.B. Pandey et al. (2023). Multiwavelength study of the luminous GRB 210619B observed with Fermi and ASIM. (external link)
• Zhongjian Liu; Kuang Liang Koh; Andrey Mezentsev et al. (2016). Variable phase propagation velocity for long-range lightning location system. (external link)
• Nikolai Østgaard; Brant Edward Carlson; Ragnhild Schrøder Nisi et al. (2016). Relativistic electrons from sparks in the laboratory. (external link)
• Andrey Mezentsev; Nikolai Lehtinen; Nikolai Østgaard et al. (2018). Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs. (external link)
• Martino Marisaldi; Nikolai Østgaard; Andrey Mezentsev et al. (2024). Highly dynamic gamma-ray emissions are common in tropical thunderclouds. (external link)
• Ingrid Bjørge-Engeland; Nikolai Østgaard; Martino Marisaldi et al. (2024). High Peak Current Lightning and the Production of Elves. (external link)
• Anders Lindanger; Chris Alexander Kallevik Skeie; Martino Marisaldi et al. (2022). Production of Terrestrial Gamma-Ray Flashes During the Early Stages of Lightning Flashes. (external link)
• David Alexandre Stephan Sarria; Nikolai Østgaard; Martino Marisaldi et al. (2023). Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations. (external link)
• Pavlo Kochkin; David Alexandre Stephan Sarria; Nikolai Grigorievich Lehtinen et al. (2021). A Rapid Gamma-Ray Glow Flux Reduction Observed From 20 km Altitude. (external link)
• Andrey Mezentsev; Nikolai Østgaard; Martino Marisaldi et al. (2024). Discerning TGF and Leader Current Pulse in ASIM Observation. (external link)
• Chris Alexander Kallevik Skeie; Nikolai Østgaard; Andrey Mezentsev et al. (2022). The Temporal Relationship Between Terrestrial Gamma-Ray Flashes and Associated Optical Pulses From Lightning. (external link)
• Carolina Maiorana; M. Marisaldi; Martin Füllekrug et al. (2021). Observation of Terrestrial Gamma-Ray Flashes at Mid Latitude. (external link)
• Nikolai Østgaard; Hugh J. Christian; J. Eric Grove et al. (2019). Gamma Ray Glow Observations at 20-km Altitude. (external link)

Conference poster

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

Conference lecture

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

Lecture

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

See a complete overview of publications in NVA.