Japan Geoscience Union Meeting 2024

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[E] Poster

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 5:15 PM - 6:45 PM Poster Hall (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)

5:15 PM - 6:45 PM

[PEM12-P30] Study of the airglow responses to geomagnetic storms based on long-term observations at three locations in Japan

*Yuto Hotta1, Kazuo Shiokawa1, Yuichi Otsuka1 (1.Institute for Space-Earth Environmental Research, Nagoya University)

Keywords:airglow, geomagnetic storm, mesosphere, thermosphere, ionosphere

In this presentation, we investigated responses of 6 types of mesospheric and thermospheric nocturnal airglow intensities (OH, O2, O(557.7nm), Na(589.3nm), O(630.0nm), O(777.4nm)) and OH and O2 rotational temperatures to geomagnetic storms based on superposed epoch analysis using long-term data obtained over Japan. We used airglow data obtained by the Airglow Temperature Photometers (ATPs) of Optical Mesosphere Thermosphere Imagers (OMTIs) at Rikubetsu (RIK) (43.5°N, 143.8°E, 2004.3.15-2023.10.31), Shigaraki (SGK) (34.8°N, 136.1°E, 2010.7.5-2023.10.31), and Sata (STA) (31.0°N, 130.7°E, 2004.1.1-2023.10.31) in Japan. First, we investigated the responses to 193 geomagnetic storms that existed during the period, but no significant responses were found. Next, we investigated the responses to 46 storms with minimum Dst values below -100 nT. As a result, we confirmed that the intensity of O2 and O(557.7nm) in the mesosphere and O(630.0nm) and O(777.4nm) in the thermosphere increased after the storms. These responses were more pronounced at higher latitudes (Rikubetsu). No noticeable variations were seen for the rotational temperatures. One possible reason for the increase of the mesospheric airglow intensity is that atomic oxygen produced by the dissociation of O2 molecules are transported from the auroral zone to lower latitudes. The response in thermospheric airglow is 1-2 days after the storm. We will discuss possible causes of these responses in the context of dynamical and chemical reaction of the upper atmosphere to geomagnetic storms.