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-EM10] Dynamics of Magnetosphere and Ionosphere

Mon. May 27, 2024 1:45 PM - 3:00 PM Exhibition Hall Special Setting (2) (Exhibition Hall 6, Makuhari Messe)

convener:Shun Imajo(Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University), Akimasa Ieda(Institute for Space-Earth Environmental Research, Nagoya University), Yuka Sato(Nippon Institute of Technology), Akiko Fujimoto(Kyushu Institute of Technology), Chairperson:Masakazu Watanabe(Graduate School of Science, Kyushu University), Akira Kadokura(National Institute of Polar Research)

2:15 PM - 2:30 PM

[PEM10-13] Characteristics of eastward expansion of substorm auroral bulge

*Akira Kadokura1 (1.National Institute of Polar Research)

Keywords:substorm, aurora

After the expansion phase onset of a substorm, auroral bulge expands poleward, westward, and eastward. Its westward expansion is characterized by the rapid westward motion of the Westward Traveling Surge (WTS) on the expanding front. On the other hand, diffuse and pulsating aurora, auroral torch, and Omega-band usually appear and embedded in the eastern part of the bulge, and a discrete aurora is expanding eastward around the poleward edge of the bulge. Such features are well-known and a large amount of studies on the evolution of the substorm bulge have been done so far. But number of studies on the mechanism of the eastward expansion of the bulge seems not so large, comparing with that of the WTS, although number of studies on the evolution of the torch, Omega-band, and pulsating aurora is relatively large. In this study, we will examine details of the evolution of the eastward expansion of bulge at the eastward expanding front by using ground-based observations at Syowa Station, Antarctica.