Nonlinear phenomena in the high latitude ionosphere F region induced by O-and X-mode HF pumping at EISCAT

Experimental results from multi-instrument observations at the EISCAT HF heating facility at Tromsø, Norway, are presented. We compare distinctive features of artificial plasma turbulences in the high latitude ionosphere F-region induced by powerful HF electromagnetic waves with the ordinary (O-mode) and extraordinary (X-mode) polarization.