Reflection Characteristics of Layered Media in Polar Mesopause Related to Polar Mesosphere Summer Echoes  

作　　者：李海龙 吴健 黄际英 王茂琰 

机构地区：[1]School of Physical Electronics, University of Electronic Science and Technology of China [2]State Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation [3]School of Science, Xidian University

出　　处：《Plasma Science and Technology》2010年第4期416-420,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos.40831062, 60971034);the Scientific Research Starting Foundation of University of Electronic Science and Technology of China (No.Y02002010401066)

摘　　要：Polar mesosphere summer echoes （PMSE） are very strong radar echoes from alti- tudes close to the polar summer mesopause. The data from sounding rocket campaigns indicate that the radar signal to noise ratio （SNR）, electron density and dust charge density of polar meso- sphere in summer show obvious layered structure. In this paper the theory of wave propagation in layered media is used to study the reflectance and SNR at each layer in polar mesosphere. The calculated SNR using theory of dusty plasma is found in good agreement with the experimental result, which may imply that the intensity of the radar echoes reflected by the layered structure in polar mesosphere where polar mesosphere summer echoes used to occur can interpret partially the phenomenon of PMSE. In other words, reflection may play an important role in the occurrence of PMSE.Polar mesosphere summer echoes （PMSE） are very strong radar echoes from alti- tudes close to the polar summer mesopause. The data from sounding rocket campaigns indicate that the radar signal to noise ratio （SNR）, electron density and dust charge density of polar meso- sphere in summer show obvious layered structure. In this paper the theory of wave propagation in layered media is used to study the reflectance and SNR at each layer in polar mesosphere. The calculated SNR using theory of dusty plasma is found in good agreement with the experimental result, which may imply that the intensity of the radar echoes reflected by the layered structure in polar mesosphere where polar mesosphere summer echoes used to occur can interpret partially the phenomenon of PMSE. In other words, reflection may play an important role in the occurrence of PMSE.

关 键 词：polar mesosphere summer echoes layered media dusty plasma DUST 

分 类 号：TN957.51[电子电信—信号与信息处理]