Japan Geoscience Union Meeting 2023

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[E] Online Poster

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

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

Mon. May 22, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (2) (Online Poster)

convener: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), Yue Deng(University of Texas at Arlington)


On-site poster schedule(2023/5/21 17:15-18:45)

10:45 AM - 12:15 PM

[PEM12-P17] Study of Nighttime Mid-latitude E-F Coupling in Geomagnetic Conjugate Regions Using a Double-thin-shell Model and Multi-source Data

*Weizheng Fu1, Tatsuhiro Yokoyama1, Nicholas Ssessanga2, Guanyi Ma3, Mamoru Yamamoto1 (1.Research Institute for Sustainable Humanosphere, Kyoto University, 2.4DSpace, Department of Physics, University of Oslo, 3.National Astronomical Observatories, Chinese Academy of Sciences, China)

Keywords:MSTID, GNSS-TEC, E-F coupling

Geomagnetic conjugate mid-latitude nighttime ionospheres are frequently simultaneously populated with electrified nighttime medium-scale traveling ionospheric disturbances (MSTIDs). Earlier observations and theoretical analysis have underscored the ionosphere E-F coupling and the postulation of coupled conjugate hemispheres, playing a pivotal role in the formation of electrified MSTIDs. In this paper, the conjugate MSTIDs are studied to elucidate the causes and effects of E-F coupling in the interhemispheric coupled ionosphere. The hemisphere-coupled ionospheres over Japan and Australia are observed and analyzed using total electron content (TEC) measurements, supplemented with multi-source observations from ionosondes, ICON (neutral wind), COSMIC (electron density) and Swarm (magnetic field). A double-thin-shell model is introduced to analyze the ionospheric responses in E and F regions during the coupling process. For the first time, observation results provide the evidence that F-region geomagnetic conjugate irregularities in both hemispheres are mainly driven by the Es layers in the summer hemisphere. The Es layer in the summer hemisphere subsequently triggers local E-F coupling and inter-hemispheric coupling. In the winter hemisphere, Es layers show amplitude reduction or even dissipation during the interhemispheric coupling process. Furthermore, thermospheric winds and non-equipotential magnetic field lines are presumed candidates for the inter-hemispheric asymmetry in MSTIDs amplitudes and growth rates.