Abstract:

Using the incoherent scatter radar, the polar ionospheric modification experiments are carried out in summer 2009 at Troms, Norway. The electron temperature enhancements in the heating campaign can be distinguished to two kinds: a small scale structure near 150km with a larger relative enhancement and a large scale structure between 150km-400km with a stronger absolute value. The percent of the temperature enhancement linearly increases with heating power in all the heating case, and the increase velocity decreases with the pump frequency increase. A clear 2D distribution can be found in measurement on August 15, and the preponderant direction of heating effects is close to field-aligned. The heating effects are obviously affected by the angle between heating beams and field-aligned. With the increase of the angle, the increment of temperature decay.

Key words: Electron temperature enhancement.