Atmospheric electricity has been intensively studied during the last 30 years after the
discovery in 1989 of different forms of upper atmospheric electrical discharges (so–called …

In this study, we present a current state-of-the-art review of middle-to-near IR emission
spectra of four simple astrophysically relevant molecular radicals—OH, NH, CN and CH. The …

Positive streamers are thought to propagate by photo-ionization; the parameters of photo-
ionization depend on the nitrogen: oxygen ratio. Therefore we study streamers in nitrogen …

It is by now well understood that large sprite discharges at the low air densities of the
mesosphere are physically similar to small streamer discharges in air at standard …

Photo-ionization is the accepted mechanism for the propagation of positive streamers in air
though the parameters are not very well known; the efficiency of this mechanism largely …

Positive streamers need a source of free electrons ahead of them to propagate. A streamer
can supply these electrons by itself through photo-ionization, or the electrons can be present …

Positive streamer discharges have been studied and modelled extensively in air. Here we
study positive streamers in CO 2 with and without oxygen admixtures; they are relevant for …

Modeling individual free electrons can be important in the simulation of discharge streamers.
Stochastic fluctuations in the electron density can accelerate the branching of streamers. In …

Streamer electrical discharges are often investigated with computer simulations of density
models (also called reaction-drift-diffusion models). We review these models, detailing their …

CO 2 is a promising gas for the replacement of SF 6 in high-voltage transmission and
distribution networks due to its lower environmental impact. The insulation properties of CO …