4:00 PM - 4:15 PM
[MIS09-03] Observation of FM radio wave propagation anomaly at Shimabara area and the anomaly before 2016 Kumamoto earthquake
In this study, by the method of Maeda and Heki (2016), we created a system that automatically detects the occurrence of Es from the short-term change of the total electron content. This system made it possible to check if Es is responsible for the detected FM wave propagation. Before the Kumamoto earthquake, April 13, 2016, VHF propagation was received at Shimabara station, but Es was not detected at the same time.
At the Shimabara receiving station, to identify the direction of the received data signal, we set the 6 antennas toward various azimuths. In the observation data before the occurrence of the Kumamoto earthquake on April 16, 2016, the intensity of the received data of the 15th day preceding the Kumamoto earthquake was stronger from the east direction. This means that we could identify the direction of the radio wave.