Variations of atmospheric tides over the equator observed with Kototabang meteor radar, Indonesia (0S, 100E)

Satellite and ground-based radar observations have been revealing the complicated structure of atmospheric tides in the MLT region, and now the significance of non-migrating tides is widely recognized. However, the lack of data sampling in spatial and time domains makes it difficult to clarify the transient tidal characteristics with complicated latitudinal-longitudinal structures. As a part of CPEA (Coupling Processes in the Equatorial Atmosphere) project, RASC, Kyoto University and LAPAN, Indonesia started a meteor radar observation (37.7MHz) at the EAR (Equatorial Atmosphere Radar) site, Kototabang, West Sumatra, Indonesia in November 2002. The radar is located just on the equator, where the migrating S(1,1) mode is small, but various non-migrating modes are significant. In this study, diurnal, semidiurnal tides over West Sumatra are reported by using the observational data over one year. Short-time and long-time variations of tidal parameters will be focused.