2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167163The interaction of streamers in nitrogen-oxygen mixtures such as air is studied. First, an efficient method for fully three-dimensional streamer simulations in multiprocessor machines is introduced. With its help, we find two competing mechanisms how two adjacent streamers can interact: through electrostatic repulsion and through attraction due to nonlocal photo-ionization. The non-intuitive effects of pressure and of the nitrogen-oxygen ratio are discussed. As photo-ionization is experimentally difficult to access, we finally suggest to measure it indirectly through streamer interactions.4 pages, 4 figuresPlasma PhysicsAtmospheric and Oceanic PhysicsFluid Dynamicstext