Japan Geoscience Union Meeting 2023

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[E] Oral

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

[P-EM14] Frontiers in solar physics

Tue. May 23, 2023 10:45 AM - 12:15 PM Exhibition Hall Special Setting (2) (Exhibition Hall 8, Makuhari Messe)

convener:Shin Toriumi(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Takaaki Yokoyama(School of Science, Kyoto University), Shinsuke Imada(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Alphonse Sterling(NASA/MSFC), Chairperson:Shinsuke Imada(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Alphonse Sterling(NASA/MSFC)

10:45 AM - 11:07 AM

[PEM14-05] Suppression of Torus Instability on the Sun and Other Cool Stars

★Invited Papers

*Xudong Sun1, Tibor Torok2, Marc DeRosa3 (1.University of Hawai'i at Manoa, 2.Predictive Science Inc., 3.Lockheed Martin Solar and Astrophysics Laboratory)

Keywords:Coronal mass ejection, Torus instability, Magnetic field

Despite the frequent detection of stellar super flares, reports on stellar coronal mass ejections (CMEs) are rare. This is in contrast with our Sun, where almost all large flares are accompanied by a CME. In this talk, I will review this so-called “missing stellar CME conundrum”. I will then use an analytical coronal magnetic field model to demonstrate that the torus instability, a leading mechanism for solar CMEs, tends to be suppressed in stellar magnetic environment. Contributing factors include larger starspots, stronger global dipole field, and more closed magnetic geometry compared to the Sun. Suppression of the torus instability may contribute to the low apparent CME rate on cool stars.