Improving Detection Performance of Ionospheric Disturbances due to Earthquake by Optimization of Sequential Measurement CombinationSeonho Kang, Deokhwa Han, Junesol Song, Bugyeom Kim, Hyoungmin So, Gapjin Kim and Changdon KeeE3S Web Conf., 94 (2019) 04001DOI: https://doi.org/10.1051/e3sconf/20199404001