EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Fundamental Mechanism of Solar Eruption Initiation

Chaowei Jiang1, Xueshang Feng1, Rui Liu2, Xiaoli Yan3, Qiang Hu4, and Ronald L. Moore4
Chaowei Jiang et al.
  • 1Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen, China (
  • 2Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
  • 3Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
  • 4Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, Huntsville, USA

Solar eruptions are spectacular magnetic explosions in the Sun's corona and how they are initiated remains unclear. Prevailing theories often rely on special magnetic topologies, such as magnetic flux rope and magnetic null point, which, however, may not generally exist in the pre-eruption source region of corona. Here using fully three-dimensional magnetohydrodynamic simulations with high accuracy, we show that solar eruption can be initiated in a single bipolar configuration with no additional special topology. Through photospheric shearing motion alone, an electric current sheet forms in the highly sheared core field of the magnetic arcade during its quasi-static evolution. Once magnetic reconnection sets in, the whole arcade is expelled impulsively, forming a fast-expanding twisted flux rope with a highly turbulent reconnecting region underneath. The simplicity and efficacy of this scenario argue strongly for its fundamental importance in the initiation of solar eruptions.

How to cite: Jiang, C., Feng, X., Liu, R., Yan, X., Hu, Q., and Moore, R. L.: A Fundamental Mechanism of Solar Eruption Initiation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10493,, 2021.

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