Cerenkov radiation and electromagnetic pulse produced by electron beams traversing a finite path in air

Coherent C\ifmmode \check{}\else \v{}\fi{}erenkov radiation has been investigated previously in the time domain for an infinite path. The present calculations for a finite path length show an effect analogous to diffraction (in the frequency domain) in which radiation fields appear both at C\ifmmode \check{}\else \v{}\fi{}erenkov angles and at other angles. The latter have previously been named electromagnetic pulse fields.