The Lunar Atmospheric Tide And It Effects On The Ionospheric Es-layer And F2 Layer

The lunar atmospheric tide is predominantly generated by gravitational force of the moon. Its forcing is exactly known, so attractive for many interesting of scholar's. The lunar atmospheric tide concentrates mainly on the lower, denser regions of the atmosphere and then propagates upward to the upper atmosphere in the form of various tidal oscillation modes. Studying the lunar atmospheric tide at 76-98 km can help us know how the mesosphere atmosphere affects on it, when it propagates upwards. The lunar atmospheric also effects on the ionosphereic Es-layer and F2 layer. The lunar semidiurnal oscillation has been found in the parameters of Es-layer and F2 layer. So studying the lunar atmospheric tide is important to know the background atmosphere, which influences the physical character of the ionosphere. At presents, with the developing of technology of different kind's radar, the observed data at various heights afford a good tool to study the lunar atmospheric tide.In this dissertation, the seasonal and height variations and the symmetry of the lunar atmospheric tide in middle and lower thermosphere over Wuhan and Adelaide are analyzed using the least-squares method. The observed result of the lunar atmospheric tide is compared with the GSWM model result over Wuhan. Using the simultaneous observed data of Wuhan meteor radar and Wuhan ionosonde, the influence of meteor shower to Es-layer is analyzed. It is analyzed the lunar tide effects in Es-layer and F2 layer of the ionosphere, too. The following main conclusions are gotten as follows:1. The lunar atmospheric semidiurnal tide at middle and lower - thermosphere over Wuhan varies with season and height. The lunar atmospheric semidiurnal tide at middle and lower thermosphere (MLT) over Wuhan has seasonal and height variations. Both of the eastward and northward components of the lunar atmospheric semidiurnal tide reach the maximum values in January, and during July-August, there is secondary peak. The analyses of lunar atmospheric semidiurnal tide over Adelaide, which is symmetry with Wuhan to equator, shows that the eastward component amplitude of tide reaches maximum values in October and the...