Abstract
Nonlinear interactions between the high frequency electric field applied through a cavity and a plasma are experimentally studied. The increase of the density is observed in the upstream side of the plasma, whereas the decrease of the density and the increase of the electron temperature are observed in the downstream side. The relationship of the density depression with the electric field is the exponential type as expected for the electric field lower than a certain value. However, the density depression is linearly proportional to the electric field, when the amplitude of the high frequency wave is modulated.
