Japan Geoscience Union Meeting 2024

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[E] Oral

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

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

Thu. May 30, 2024 3:30 PM - 4:45 PM Exhibition Hall Special Setting (2) (Exhibition Hall 6, Makuhari Messe)

convener:Keisuke Hosokawa(Department of Communication Engineering and Informatics, University of Electro-Communications), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University), Chairperson:Paul Prikryl(Physics Department University of New Brunswick and Geomagnetic Laboratory Natural Resources Canada), Nozomu Nishitani(Institute for Space-Earth Environmental Research, Nagoya University)

4:30 PM - 4:45 PM

[PEM12-20] Simulation study of atmosphere-ionosphere variations driven by the eruption of Tonga volcano

*Hiroyuki Shinagawa1, Yasunobu Miyoshi2 (1.International Research Center for Space and Planetary Environmental Science, Kyushu University, 2.Faculty of Sciences, Kyushu University)

Keywords:Tonga volcanic eruption, atmosphere, ionosphere, variation, simulation, compressibility

The volcanic eruption of Hunga Tonga-Hunga Ha'apai occurred on 15 January 2022 generated significant variations in the ocean, atmosphere and ionosphere. Large amount of data of the atmosphere and the ionosphere associated with the eruption have been obtained. Several simulation studies have also been made to investigate the atmosphere-ionosphere variations driven by the volcanic eruption. Although the atmospheric models based on hydrostatic equilibrium have reproduced the overall variations of the atmosphere and the ionosphere reasonably well, some phenomena related with compressibility of the atmosphere have not been fully investigated. To study those phenomena, we used an axisymmetric three-dimensional nonhydrostatic atmospheric model and the whole atmosphere-ionosphere coupled model GAIA. We found that the simulation can reproduce various kinds of atmospheric waves generated by the eruption, such as acoustic waves, gravity waves, Lamb waves, Pekeris waves, TIDs concentrically propagating from the eruption site, and resonant atmospheric oscillations with a period of about 4 minutes. In addition, the results indicate that the eruption generated supersonic shock waves above the volcanic region, leading to the extremely large variations in the thermosphere and ionosphere. We will report some recent simulation results and discuss the atmosphere-ionosphere phenomena by comparing the results with the observations.

References
Shinagawa, H., Miyoshi, Y. (2024) Simulation study of atmosphere-ionosphere variations driven by the eruption of Hunga Tonga-Hunga Ha'apai on 15 January 2022. Earth Planets Space 76:15.
https://doi.org/10.1186/s40623-024-01960-6