[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

[PEM12-P09] Development of an Ionospheric-Plasmaspheric Data Assimilation Model

*CHIYEN LIN^1,2、Jann-Yenq LIU^1,2,3、Charles Lin⁴ (1.Center for Astronautical Physics and Engineering, National Central University, TAIWAN、2.Department of Space Science and Engineering, National Central University, Taiwan、3.Center for Space and Remote Sensing Research, National Central University, Taiwan.、4. Department of Earth Sciences, National Cheng Kung University, Taiwan.)

キーワード：Ionosphere, Plasmasphere, Data Assimilation, FORMOSAT-7/COSMIC-2

The data assimilation model global ionospheric specification (GIS) reconstructs ionospheric three-dimensional electron density structure by using a Gaussian-Markov Kalman filter to assimilate ground-based GNSS slant total electron content (TEC) and FORMOSAT-7/COSMIC-2 radio occultation slant TEC observations. The study based on GIS to extends the altitude boundary of the model from the ionosphere to the lower plasmasphere (from 1,000 to 21,000 km). The new ionospheric-plasmaspheric data assimilation model could assimilate the completed sounding path of ground-based GNSS slant TEC and F7/C2 absolute TEC (podTc2) to improve ionospheric electron density structure and also reconstruct the plasmasphere. The observing system simulation experiment (OSSE) is applied to confirm the accuracy of the reconstructed electron density structure in the ionosphere and plasmasphere. The OSSE demonstrates that analysis results are similar to the simulation truth, indicating that the model can reconstruct the ionosphere and the plasmasphere. In addition, electron density reconstruction is also being implemented to study the influence of geomagnetic storms on the ionosphere and plasmasphere.