Excitation of quasielectrostatic waves in a laboratory magnetoplasma with weak spatial dispersion.

Short-wavelength quasielectrostatic waves radiated by a small probe in a cold (T(e) approximately 0.5 eV) laboratory magnetoplasma are studied in both the upper-hybrid (UH) and the lower-hybrid (LH) frequency ranges. Measured radiation patterns are characterized by resonance cones in the LH range and in the low-frequency part of the UH range (at omega < 2omega(c)), while in its high-frequency part (at omega > 2omega(c)), a beamed radiation along the external magnetic field is observed.