  Using a streak camera, we directly measure time- and space-resolved dynamics
of N2+ emission from a self-seeded filament. We observe characteristic
signatures of superfluorescence even under ambient conditions and show that the
timing of the emitted light varies along the length of the filament. These
effects must be taken into consideration for accurate modelling of light
filaments in air, and can be exploited to engineer the temporal profile of
light emission in air lasing.
