Observations of the Heating Experiments in the Polar Winter Ionosphere

Abstract

AbstractAccording to the analysis of the ISR observation data, the heating effects in polar winter ionospheric modification experiments carried out in January 2008 at Tromsø, Norway were studied. A clear disturbance effect is present under the O‐mode over‐dense heating conditions. The enhancement of the electron temperature is up to 60%~120%, extending from 150 km to 400 km. The disturbance of the electron density is not obvious, with a 12% maximum decrease. An 1~2 kHz increase at the acoustic frequency can be observed, and an enhancement in the peak‐to‐valley ratio of the ion line and sometimes its high‐order harmonics can be seen as well. The power of the ion line and plasma line has shown an overshoot effect, single‐humped, double‐humped and triple‐humped structures have appeared in the power profile of plasma line, and the enhancement in power amplitude of the plasma line decreases exponentially as the frequency increases.