[P-EM05_2AM1] Characteristics of atmospheric waves in the mesosphere-lower thermosphere (MLT)

[PEM05-01] A Brief History of Collaborative Study on Equatorial MLT Dynamics using Meteor and MF Radars in Indonesia

*TSUDA Toshitaka¹、DJAMALUDDIN Thomas²、YATINI Clara²、BUDIYONO Afif²、VINCENT Robert³、REID Iain³ (1.Research Institute for Sustainable Humanosphere (RISH), Kyoto University、2.Indonesian National Institute of Aeronautics and Space (LAPAN)、3.Department of Physics, University of Adelaide)

キーワード：mesosphere and lower thermosphere, equaotrial atmosphere, atmospheric waves, meteor radar, medium frequency radar, Indonesia

In the tropics active cumulus convection generates various atmospheric waves, such as Kelvin waves, planetary waves, tides, and gravity waves. The wave energy and momentum are transported upward though propagating of these waves. Wave-mean flow interactions are crucially important for understanding of dynamical processes in the equatorial atmosphere, including the formation of peculiar long-term variations such as quasi-biennial oscillation (QBO) and semi-annual oscillation (SAO) in both the stratosphere and the MLT (mesosphere and lower thermosphere) region (70-120 km). We constructed a total of five meteor and medium frequency (MF) radars in Indonesia since 1992 under close collaboration between RISH, LAPAN and the University of Adelaide. The MLT radar network has been expanded in India, Central and Eastern Pacific, and China. These radars have clarified the behavior of atmosphere dynamics in the MLT region. This paper gives an overview of our collaborative studies as well as highlights of scientific achievements using the MLT radar network