Study of gravity wave characteristics in the polar mesopause region based on meteor echo observations

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Mainly based on radar meteor echo measurements we studied the behaviour of polar mesopause region (around 90 km altitude), especially, atmospheric gravity waves, which transport significant amount of momentum and energy in the atmosphere. Horizontal propagation directions of observed gravity waves showed clear seasonal and height dependence, which is thought to be due to interaction with background winds. We also developed techniques to apply meteor echo measurements to non-meteor radars such as SuperDARN radars in order to conduct more meteor echo observations in the polar region.