Observation of Bernstein Wave Propagating Obliquely to the Magnetic Field in a Streaming Plasma

Bernstein wave propagating obliquely to the magnetic field is excited by a coaxial antenna in a streaming plasma and detected by the interferometer system, which shows that the dispersion relation for the wave is consistent with the theoretical result. The other wave-like signal with shorter 'wavelength' is observed only on the downstream of the exciting antenna and its 'phase velocity' is approximately equal to the velocity of plasma stream calculated from tbe Doppler shifts of Bernstein waves on both UPand down-streams, which may show that the signal does not propagate as the wave but floats down the plasma stream as the modulation of plasma particles.