[PEM15-P09] Anomalous ambipolar diffusion observed using meteor radars in northern high latitudes
Keywords:ambipolar diffusion coefficient, meteor radars, polar mesosphere and lower thermosphere
We found that the ambipolar diffusion in the polar mesopshere was sometimes anomalously enhanced in Arctic meteor radar observations. Comparison with collocated Na lidar and EISCAT radars in Tromsoe showed that such enhancements were not observed in neutral temperature field, and that enhanced electric field in the lower thermosphere seemed responsible for the anomalous ambipolar diffusion. This further indicates that meteor radar observations in polar regions have a potential to give a certain measure of electric field in the lower thermosphere and even the upper mesosphere, which is very difficult to observe without an incoherent scatter radar.