Conference lecture

• Øystein Håvard Færder; Nikolai Grigorievich Lehtinen; David Alexandre Stephan Sarria et al. (2025). A parameter-space exploration of the Relativistic Discharge Model mapping for which conditions ALOFT’s Flickering Gamma-ray Flashes are produced. (external link)
• Thomas Gjesteland; Nikolai Østgaard; Andrew B. Collier et al. (2011). Confining the angular distribution of TGF emission. (external link)
• Nikolai Lehtinen; Nikolai Østgaard (2015). Dimension of a fractal streamer structure. (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)
• Nikolai Lehtinen; Umran S. Inan; Nikolai Østgaard (2014). On the spatial scale of streamers. (external link)
• Nikolai Lehtinen; Umran S. Inan; Nikolai Østgaard (2014). On the Spatial Scale of Streamers. (external link)
• Nikolai Lehtinen; Nikolai Østgaard; Umran S. Inan (2014). Dynamics of a streamer structure. (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)

Conference poster

• Øystein Håvard Færder; Nikolai Grigorievich Lehtinen; David Alexandre Stephan Sarria et al. (2025). Systematic reproduction of hard radiation from thunderclouds including ALOFT’s Flickering Gamma-ray Flashes using an ODE model resembling a Lotka-Volterra predator-prey system. (external link)
• David Alexandre Stephan Sarria; Nikolai Østgaard; Ingrid Bjørge-Engeland et al. (2025). Evidence of gamma-ray glows observed in the relativistic feedback regime during the ALOFT 2023 flight campaign. (external link)
• Nikolai Lehtinen; Pavlo Kochkin; Nikolai Østgaard (2016). X-ray Production in a Laboratory Streamer Discharge. (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 Lehtinen; Nikolai Østgaard et al. (2017). Spectral characteristics of VLF sferics associated with TGFs. (external link)
• Nikolai Lehtinen; Pavlo Kochkin; Nikolai Østgaard (2017). Mechanisms of X-ray production in laboratory streamers. (external link)
• Andrey Mezentsev; Nikolai Lehtinen; Nikolai Østgaard et al. (2016). Spectral characteristics of VLF sferics associated with TGFs. (external link)
• Nikolai Østgaard; Martino Marisaldi; Pavlo Kochkin et al. (2017). How should we define terrestrial gamma-ray flashes?. (external link)
• Nikolai Lehtinen; Brant Edward Carlson; Pavlo Kochkin et al. (2017). Mechanisms important to later stages of streamer system development. (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)
• 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)
• Nikolai Lehtinen; Nikolai Østgaard; Pavlo Kochkin (2015). Modeling of the laboratory streamer discharge. (external link)

Academic article

• Anthony Jeseněk; Alejandro Luque; Nikolai Grigorievich Lehtinen (2025). Partial ionisation cross sections for the binary-encounter Bethe model. (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)
• 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; Torsten Neubert; Victor Reglero et al. (2019). First 10 Months of TGF Observations by ASIM. (external link)
• Anthony Schmalzried; Alejandro Luque; Nikolai Grigorievich Lehtinen (2022). Combined molecular and atomic potentials for elastic cross sections of electrons scattering off diatomic molecules at intermediate energies. (external link)
• Anthony Schmalzried; Alejandro Luque; Nikolai Grigorievich Lehtinen (2022). Enhancing higher-energy spectral resolution for electron particle simulations in air. (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)
• Karl Magnus Laundal; Stein Haaland; Nikolai Lehtinen et al. (2015). Birkeland current effects on high-latitude ground magnetic field perturbations. (external link)
• Dongshuai Li; Alejandro Luque; Nikolai Grigorievich Lehtinen et al. (2022). Multi-Pulse Corona Discharges in Thunderclouds Observed in Optical and Radio Bands. (external link)
• Nikolai Grigorievich Lehtinen (2021). Physics and Mathematics of Electric Streamers. (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 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)
• Nikolai Lehtinen; Nikolai Østgaard (2018). X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge. (external link)
• Pavlo Kochkin; Nikolai Lehtinen; Alexander P.J. Van Deursen et al. (2016). Pilot system development in metre-scale laboratory discharge. (external link)
• Nikolai Grigorievich Lehtinen; Robert Marskar (2021). What Determines the Parameters of a Propagating Streamer: A Comparison of Outputs of the Streamer Parameter Model and of Hydrodynamic Simulations. (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)
• Dongshuai Li; Alejandro Luque; F.J. Gordillo-Vazquez et al. (2023). Different Types of Corona Discharges Associated With High-Altitude Positive Narrow Bipolar Events Nearby Cloud Top. (external link)
• Rasoul Kabirzadeh; Nikolai Lehtinen; Umran S. Inan (2015). Latitudinal dependence of static mesospheric e fields above thunderstorms. (external link)
• Chris Alexander Skeie; Nikolai Østgaard; Nikolai Lehtinen et al. (2020). Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges. (external link)
• Andrey Mezentsev; Nikolai Lehtinen; Nikolai Østgaard et al. (2018). Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs. (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)
• Martino Marisaldi; Nikolai Østgaard; Andrey Mezentsev et al. (2024). Highly dynamic gamma-ray emissions are common in tropical thunderclouds. (external link)
• F.J. Pérez-Invernón; Nikolai Lehtinen; F.J. Gordillo-Vázquez et al. (2017). Whistler Wave Propagation Through the Ionosphere of Venus. (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)
• Thomas Gjesteland; Nikolai Østgaard; A. B. Collier et al. (2011). Confining the angular distribution of terrestrial gamma ray flash emission. (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)
• Nikolai Østgaard; Brant Edward Carlson; Ragnhild Schrøder Nisi et al. (2016). Relativistic electrons from sparks in the laboratory. (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)
• 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)
• 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)
• Nikolai Østgaard; Hugh J. Christian; J. Eric Grove et al. (2019). Gamma Ray Glow Observations at 20-km Altitude. (external link)
• Evgeny Mishin; Brenton Watkins; Nikolai Lehtinen et al. (2016). Artificial ionospheric layers driven by high-frequency radiowaves: An assessment. (external link)
• Can Liang; Brant Edward Carlson; Nikolai Lehtinen et al. (2014). Differing current and optical return stroke speeds in lightning. (external link)

Lecture

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

See a complete overview of publications in NVA.