[en] In low density PLT discharges (n/sub e/ < about 1.0 x 10¹³ cm^-3) emission near, and far below, the central electron plasma frequency has been observed. The motivation for these measurements originates from theories that explain the evolution of ''slideaway'' electron tails in low density ohmicallyheated and lower-hybrid-current-driven discharges (Parail and Pogutse¹, Liu et al², and Taylor et al³) with the assistance of electrostatic plasma waves. These waves are excited through the interplay of the anomalous Doppler resonance and the Cerenkov resonance. Measurements were made with an absolute calibrated scanning (2-18 GHz) heterodyne receiver connected to a broadband spiral antenna. The measured emission near and below the plasma frequency is nonthermal with radiation temperature, Tr about 20-500 keV. The shape of the spectrum is not sensitive to the plasma density, but is strongly dependent on the toroidal magnetic field