Abstract

We show that atomic gases can support solitary pulses of a unipolar electromagnetic field (``EM bubbles'') with amplitude up to the atomic field ( $\ensuremath{\sim}$1${0}^{9}$ V/cm) and duration down to $\ensuremath{\sim}$ ${10}^{\ensuremath{-}16}$ s. EM bubbles propagate without dispersion, are stable, and are insensitive to the change of gas density. Atomic gasses can also support an EM shock wave forming a precursor of a dc ionizing field.

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