Super plasma bubbles and associated structures during geomagnetic storms

Wenjie Sun

Presentation information

[E] Oral

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

[P-EM14] Study of coupling processes in solar-terrestrial system

Wed. May 28, 2025 1:45 PM - 3:15 PM 303 (International Conference Hall, Makuhari Messe)

convener:Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University), Yasunobu Ogawa(National Institute of Polar Research), Satonori Nozawa(Institute for Space-Earth Environmental Research, Nagoya University), Akimasa Yoshikawa(Department of Earth and Planetary Sciences, Kyushu University), Chairperson:Satonori Nozawa(Institute for Space-Earth Environmental Research, Nagoya University), Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University)

2:15 PM - 2:30 PM

[PEM14-15] Super plasma bubbles and associated structures during geomagnetic storms

*Wenjie Sun¹ (1.Institute of Geology and Geophysics, Chinese Academy of Sciences)

Keywords:ionospheric plasma bubbles, irregularities, magnetic storms

Plasma blob is generally a low-latitude phenomenon occurring at the poleward edge of equatorial plasma bubble (EPB) during post-sunset periods. Here we report a case of midlatitude ionospheric plasma blob-like structure occurring along with super EPBs over East Asia around sunrise during the May 2024 great geomagnetic storm. Interestingly, the blob-like structures appeared at both the poleward and westward edges of EPBs, reached up to 40°N magnetic latitudes, and migrated westward several thousand kilometers together with the bubble. The total electron content (TEC) inside the blob-like structures was enhanced by ~50 TEC units relative to the ambient ionosphere. The blob-like structure at the EPB poleward edge could be partly linked with field-aligned plasma accumulation due to poleward development of bubble. For the blob-like structure at the EPB west side, one possible mechanism is that it was formed and enhanced accompanying the bubble evolution and westward drift.