Academic article

• 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)
• Marisaldi, Martino; Østgaard, Nikolai; Mezentsev, Andrey et al. (2024). Highly dynamic gamma-ray emissions are common in tropical thunderclouds. (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)
• 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)
• 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)
• Li, Dongshuai; Luque, Alejandro; Gordillo-Vazquez, F.J. et al. (2023). Different Types of Corona Discharges Associated With High-Altitude Positive Narrow Bipolar Events Nearby Cloud Top. (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)
• Schmalzried, Anthony; Luque, Alejandro; Lehtinen, Nikolai Grigorievich (2022). Enhancing higher-energy spectral resolution for electron particle simulations in air. (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)
• Schmalzried, Anthony; Luque, Alejandro; Lehtinen, Nikolai Grigorievich (2022). Combined molecular and atomic potentials for elastic cross sections of electrons scattering off diatomic molecules at intermediate energies. (external link)
• Bjørge-Engeland, Ingrid; Østgaard, Nikolai; Mezentsev, Andrey et al. (2022). Terrestrial Gamma-Ray Flashes With Accompanying Elves Detected by ASIM. (external link)
• Li, Dongshuai; Luque, Alejandro; Lehtinen, Nikolai Grigorievich et al. (2022). Multi-Pulse Corona Discharges in Thunderclouds Observed in Optical and Radio Bands. (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)
• 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)
• Østgaard, Nikolai; Cummer, S.A.; Mezentsev, Andrey et al. (2021). Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning. (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)
• Lehtinen, Nikolai Grigorievich (2021). Physics and Mathematics of Electric Streamers. (external link)
• Lehtinen, Nikolai Grigorievich; Marskar, Robert (2021). What Determines the Parameters of a Propagating Streamer: A Comparison of Outputs of the Streamer Parameter Model and of Hydrodynamic Simulations. (external link)
• Skeie, Chris Alexander; Østgaard, Nikolai; Lehtinen, Nikolai et al. (2020). Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges. (external link)
• Østgaard, Nikolai; Christian, Hugh J.; Grove, J. Eric et al. (2019). Gamma Ray Glow Observations at 20-km Altitude. (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; Neubert, Torsten; Reglero, Victor et al. (2019). First 10 Months of TGF Observations by ASIM. (external link)
• Lehtinen, Nikolai; Østgaard, Nikolai (2018). X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge. (external link)
• Mezentsev, Andrey; Lehtinen, Nikolai; Østgaard, Nikolai et al. (2018). Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs. (external link)
• Pérez-Invernón, F.J.; Lehtinen, Nikolai; Gordillo-Vázquez, F.J. et al. (2017). Whistler Wave Propagation Through the Ionosphere of Venus. (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)
• Mishin, Evgeny; Watkins, Brenton; Lehtinen, Nikolai et al. (2016). Artificial ionospheric layers driven by high-frequency radiowaves: An assessment. (external link)
• Kochkin, Pavlo; Lehtinen, Nikolai; Van Deursen, Alexander P.J. et al. (2016). Pilot system development in metre-scale laboratory discharge. (external link)
• Østgaard, Nikolai; Carlson, Brant Edward; Nisi, Ragnhild Schrøder et al. (2016). Relativistic electrons from sparks in the laboratory. (external link)
• Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas et al. (2016). Radio emissions from double RHESSI TGFs. (external link)
• Laundal, Karl Magnus; Haaland, Stein; Lehtinen, Nikolai et al. (2015). Birkeland current effects on high-latitude ground magnetic field perturbations. (external link)
• Kabirzadeh, Rasoul; Lehtinen, Nikolai; Inan, Umran S. (2015). Latitudinal dependence of static mesospheric e fields above thunderstorms. (external link)
• Liang, Can; Carlson, Brant Edward; Lehtinen, Nikolai et al. (2014). Differing current and optical return stroke speeds in lightning. (external link)
• Gjesteland, Thomas; Østgaard, Nikolai; Collier, A. B. et al. (2011). Confining the angular distribution of terrestrial gamma ray flash emission. (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)
• Østgaard, Nikolai; Christian, Hugh J.; Grove, Eric et al. (2017). Gamma-ray observations at 20 km altitude above thunderstorms. (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)
• Lehtinen, Nikolai; Carlson, Brant Edward; Kochkin, Pavlo et al. (2017). Mechanisms important to later stages of streamer system development. (external link)
• Lehtinen, Nikolai; Kochkin, Pavlo; Østgaard, Nikolai (2017). Mechanisms of X-ray production in laboratory streamers. (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)
• Marisaldi, Martino; Østgaard, Nikolai; Albrechtsen, Kjetil et al. (2017). A Synergic Approach to the Study of TGFs and Energetic Radiation from Thunderstorms. (external link)
• Lehtinen, Nikolai; Kochkin, Pavlo; Østgaard, Nikolai (2016). X-ray Production in a Laboratory Streamer Discharge. (external link)
• Mezentsev, Andrey; Lehtinen, Nikolai; Østgaard, Nikolai et al. (2016). Spectral characteristics of VLF sferics associated with TGFs. (external link)
• Lehtinen, Nikolai; Østgaard, Nikolai; Kochkin, Pavlo (2015). Modeling of the laboratory streamer discharge. (external link)

Academic lecture

• 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)
• Lehtinen, Nikolai; Østgaard, Nikolai (2015). Dimension of a fractal streamer structure. (external link)
• Lehtinen, Nikolai; Inan, Umran S.; Østgaard, Nikolai (2014). On the Spatial Scale of Streamers. (external link)
• Lehtinen, Nikolai; Inan, Umran S.; Østgaard, Nikolai (2014). On the spatial scale of streamers. (external link)
• Lehtinen, Nikolai; Østgaard, Nikolai; Inan, Umran S. (2014). Dynamics of a streamer structure. (external link)
• Gjesteland, Thomas; Østgaard, Nikolai; Collier, Andrew B. et al. (2011). Confining the angular distribution of TGF emission. (external link)

Lecture

• Kochkin, Pavlo; Lehtinen, Nikolai; Montanyà, Joan et al. (2016). Neutron bursts from long laboratory sparks. (external link)
• Lehtinen, Nikolai; Kochkin, Pavlo; Østgaard, Nikolai (2016). Modeling of laboratory streamer discharge features associated with observations of x-ray emissions. (external link)
• Lehtinen, Nikolai; Østgaard, Nikolai; Kochkin, Pavlo (2016). Modeling of laboratory streamer discharge features leading to x-ray emissions. (external link)

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