173 citations · 514 across the 10 of their papers we have counts for
9 papers
Gamma Ray Glow Observations at 20-km Altitude
N. Østgaard, H. J. Christian, J. E. Grove +12
In the spring of 2017 an ER-2 aircraft campaign was undertaken over continental United States to observe energetic radiation from thunderstorms and lightning. The payload consisted…
Electric streamers as a nonlinear instability: the model details
Nikolai G. Lehtinen
We propose a new approach to unambiguous determination of parameters of positive and negative electric streamer discharges. From hydrodynamic equations, in the assumption of a solu…
Pilot system development in metre-scale laboratory discharge
Pavlo Kochkin, Nikolai Lehtinen, Alexander +2
The pilot system development in metre-scale negative laboratory discharges is studied with ns-fast photography. The systems appear as bipolar structures in the vicinity of the nega…
Radio emissions from double RHESSI TGFs
Andrew Mezentsev, Nikolai Østgaard, Thomas Gjesteland +5
A detailed analysis of Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) terrestrial gamma ray flashes (TGFs) is performed in association with World Wide Lightning Loca…
Birkeland current effects on high-latitude groundmagnetic field perturbations
K. M. Laundal, S. E. Haaland, N. Lehtinen +8
Magnetic perturbations on ground at high latitudes are directly associated only with the divergence-free component of the height-integrated horizontal ionospheric current, $\textbf…
Experimental Study of Acoustic Ultra-High-Energy Neutrino Detection
J. Vandenbroucke, G. Gratta, N. Lehtinen
An existing array of underwater, large-bandwidth acoustic sensors has been used to study the detection of ultra-high-energy neutrinos in cosmic rays. Acoustic data from a subset of…