[PEM12-P11] Atmospheric wave propagation observed by GNSS-TEC: Fireball explosion and atmospheric mode
Keywords:TEC, GPS, QZSS
Next we obtained continuous TEC records in 2019 using the QZSS (Quasi-Zenith Satellite System) geostationary satellite (PRN07), which enables long-term stable TEC observations in and around Japan. We performed preliminary investigations to detect various kinds of TEC disturbances. First, we conducted spectral analysis of the QZSS-TEC time series with various time windows. As a result, we identified peaks such as the diurnal changes and its harmonics, and the rotation period of the sun. Ground observations of gravimeters and broadband seismometers revealed incessant excitation of the Earth's free oscillations. It was also found that the two components having periods close to the atmospheric modes with periods of 3- 4 minutes have significantly larger amplitudes than other components. This suggests the coupling between the solid earth and the atmosphere. It is possible that there are same frequency components in TEC variations, but it has not yet been confirmed. In this study, we examine if we can detect weak atmospheric modes by using continuous QZSS-TEC data.