A model of streamer propagation is considered. Analytical expressions for the velocity, length and width of the streamer are derived. The velocity of the streamer is proportional to its length, and the width of the streamer is proportional to the square root of its length. The results obtained are in good agreement with experiment. Mechanisms which may act as secondary processes in the streamer breakdown of gases are discussed.

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Mechanisms which may act as secondary processes in the streamer breakdown of isotropic gases and air are considered. In the case of air it is shown that mechanisms connected with the collisions of excited oxygen molecules with groundstate nitrogen and oxygen molecules play the primary role.

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