Ionospheric Space Weather Observed by Ground-Based Gnss Receivers and Formosat Satellites( I )

The ionosphere can be easily disturbed by transient events in space, the atmosphere, and the lithosphere. This project utilizes the total electron content (TEC) derived from measurements of ground-based GNSS (global navigation satellite system) receivers, RO (radio occultation) electron density profiles sounded by FORMOSAT-3 (F3) & FORMOSAT-7 (F7), and in situ plasma measurements probed by IPEI (ionospheric plasma electrodynamics instrument) onboard ROCSAT-1, AIP (advanced ionospheric probe) onboard FORMOSAT-5 (F5), & ion drift meter (IVM) onboard F7 to examine ionospheric space weather disturbed by solar eclipses and lunar phase, wave-4 non-migrating tide and plasma depletion bays (PDBs), as well as seismic and tsunami waves. The GNSS TEC and GIM (global ionosphere map) TEC will be used to study photochemical processes, transport dynamics, and lunar gravity effects during the 21 August 2017 solar eclipse, as well as ionosphere response to the lunar phase. The F3 and F7 RO electron density profiles as well as ROCSAT-1/IPEI, F5/AIP, and F7/IVM plasma measurements are employed to study wave-4 and PDBs. The GNSS TEC and in situ plasma measurements will be used to find ionospheric signatures of ocean bottom Rayleigh and tsunami waves. These ionospheric space weather studies shall lead a better understanding on the space-ionosphere-atmosphere-lithosphere coupling.