Investigation on pre-seismic equatorial ionospheric anomaly and its possible association with the gravity wave using satellite measurements

Kwangsun Ryu, Korea Advanced Institute of Science and Technology, Satellite Technology Research Center, Daejeon, South Korea, Koh-Ichiro Oyama, NCKU National Cheng Kung University, Institute of Plasma and Space Science, Tainan, Taiwan, Yang-Yi Sun, China University of Geosciences, Wuhan, Wuhan, China and Tiger J.Y Liu, Institute of Space Science and Engineering, National Central University, Taoyuan City, Taiwan