Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM14] Recent Advances in Ionosphere Observation and Modeling for Monitoring and Forecast

Thu. May 24, 2018 1:45 PM - 3:15 PM 301B (3F International Conference Hall, Makuhari Messe)

convener:Charles Lin(Department of Earth Sciences, National Cheng Kung University), Yang-Yi Sun(China University of Geosciences, Institute of Geophysics and Geomatics), Chairperson:Lin Charles, Sun Yang-Yi

2:55 PM - 3:10 PM

[PEM14-05] Data assimilation model study of day-to-day ionosphere variability using radio occultation and ground-based GNSS observations.

*Charles Lin1, CHIYEN LIN2, P. K. Rajesh1, Nicholas M Pedatella3, Chuan-Ping Lien1, Chia-Hung Chen1, Jann-Yenq Liu2 (1.Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan, 2.Institute of Space Science, National Central University, Taoyuan City, Taiwan, 3.High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA)

Keywords:Data Assimilation, FORMOSAT-3/COSMIC, FORMOSAT-7/COSMIC-2

The Earth’s ionosphere is highly variable due to its interactions with planetary waves, solar oscillations, and lunar tides overlapping on top of the original ionospheric climatological electron density morphologies. To study the strong day-to-day variability of the ionosphere, we have developed a global ionospheric data assimilation model using radio occultation observations of COSMIC mission together with auxiliary observations from ground-based GNSS stations. The assimilation system is capable of producing day-to-day and hour-to-hour ionospheric electron density maps three dimensionally for the study. With the advance given by the newly developed data assimilation model, we re-examine the wave-4 variations on daily basis, as well as the migrating tidal variations during the stratospheric sudden warming events. The products of the assimilation system using COSMIC-2 observations will be available in near future.