This book highlights latest research advance in the field of Radioscience, Equatorial Atmospheric Science and Environment as part of the International Symposium for Equatorial Atmosphere celebrating the 21st Anniversary of the Equatorial Atmosphere Radar (EAR) , organized by Research Center for Climate and Atmosphere (PRIMA) of National Research and Innovation Agency (BRIN). The symposium provides a scientific platform for researchers and professionals to discuss ideas and current issues as well as to design the solutions in the areas of space science, ocean science, atmospheric science, , environmental science, material science, and other related disciplines.