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Numerical simulations of laser-plasma interactions demonstrate the generationof axially polarized electromagnetic pulses (EMPs) that radiate away energywith a characteristic frequency determined by the plasma frequency, in the THzrange for typical laser wakefield acceleration experiments. This is confirmedby full 2D electromagnetic particle-in-cell simulations, as well as by aponderomotively-driven reduced model that captures the EMP generationessentials. When the laser's pulse length matches the plasma wavelength, thatpulse's fractional energy losses to the wakefield are independent of the pulsewidth, while the losses to the EMP are inversely dependent on the pulse width.

Terahertz Radiation from Laser-Ionized Plasmas