Japan Geoscience Union Meeting 2022

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[E] Oral

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

[P-EM13] Coupling Processes in the Atmosphere-Ionosphere System

Wed. May 25, 2022 1:45 PM - 3:15 PM 302 (International Conference Hall, Makuhari Messe)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), convener:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Institute of Space Science, National Central University), convener:Yue Deng(University of Texas at Arlington), Chairperson:Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Chia-Hung Chen(Department of Earth Sciences, National Cheng Kung University), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University)


1:45 PM - 2:00 PM

[PEM13-25] Ionospheric responses on the 21 August 2017 solar eclipse by using three-dimensional GNSS tomography

*Chia-Hung Chen1, Charles Lin1, Jann-Yenq LIU2,3,4, Akinori Saito5 (1.Department of Earth Sciences, National Cheng Kung University, 2.Center for Astronautical Physics and Engineering, National Central University, Taoyuan, Taiwan, 3.Department of Space Science and Engineering, National Central University, Taoyuan, Taiwan, 4.Center for Space and Remote Sensing Research, National Central University, Taoyuan, Taiwan, 5.Department of Geophysics, Kyoto University, Kyoto, Japan)

Keywords:Solar eclipse, 3D tomography, GNSS, Ionospheric plasma density depletion

The change of ionospheric plasma density is strongly affected by the solar activity, such as solar flare. The solar eclipse is one kinds of solar activity may cause the temporal plasma variances in the ionosphere when the moon shadow pass by. In this study, we study the 3D ionospheric plasma density stucture by using a 3D tomography algorithm with the dense GNSS networks around the Northern America during the August 2017 solar eclipse event. Results show that the most ionospheric plasma density depletion is around 40% compared with the previous day of solar eclipse, and this density depletion is distributed to all the altitudes. A Fourier analyses is further conducted to derive the vertical phase and group velocities of the ionospheric plasma propagations and try to find the disturbance source of the ionospheric plasma density during the solar eclipse.