Statistical analysis on characteristics of polar mesosphere winter echoes at 224 MHz

The main purpose of the paper is to analyze the average spatial-temporal characteristics of polar mesosphere winter echoes (PMWE)in terms of occurrence rate, duration, height distribution, daily and seasonal variation by using statistical data based on the european incoherent scatter very high frequency(EISCAT VHF) radar during 2003-2014. At the same time, some problems in the theory of correlation between PMWE with solar and geomagnetic activities are discussed.The results show that the occurrence of PMWE is very few and the duration is generally short. The average occurrence rate of PMWE is 3.26%.The average duration of each occurrence of PMWE is 67 minutes. Its height distribution ranged is 62-70 km and the highest occurrence rate occurs in the height range of 66-67 km. Secondly, it is found that PMWE mainly occurred in the daytime and rarely occurred in the night. The PMWE occurrence rate in November isrelatively high and in December is very low. It can provide an importance consult interesting to explain the physical formation mechanism of PMWE.