Unveiling the Initiation Route of Coronal Mass Ejections through Their Slow Rise Phase - Équipe Plasmas Spatiaux du Laboratoire de Physique des Plasmas (LPP)
Article Dans Une Revue The Astrophysical Journal Année : 2024

Unveiling the Initiation Route of Coronal Mass Ejections through Their Slow Rise Phase

Résumé

Understanding the early evolution of coronal mass ejections (CMEs), in particular their initiation, is the key to forecasting solar eruptions and induced disastrous space weather. Although many initiation mechanisms have been proposed, a full understand- ing of CME initiation, which is identified as a slow rise of CME progenitors in kine- matics before the impulsive acceleration, remains elusive. Here, with a state-of-the-art thermal-magnetohydrodynamics simulation, we determine a complete CME initiation route in which multiple mainstream mechanisms occur in sequence yet are tightly cou- pled. The slow rise is first triggered and driven by the developing hyperbolic flux tube (HFT) reconnection. Subsequently, the slow rise continues as driven by the coupling of the HFT reconnection and the early development of torus instability. The end of the slow rise, i.e., the onset of the impulsive acceleration, is induced by the start of the fast magnetic reconnection coupled with the torus instability. These results unveil that the CME initiation is a complicated process involving multiple physical mechanisms, thus being hardly resolved by a single initiation mechanism.
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Origine Publication financée par une institution
Origine Publication financée par une institution

Dates et versions

hal-04566052 , version 1 (03-09-2024)

Identifiants

Citer

Chen Xing, Guillaume Aulanier, Xin Cheng, Chun Xia, Mingde Ding. Unveiling the Initiation Route of Coronal Mass Ejections through Their Slow Rise Phase. The Astrophysical Journal, 2024, ⟨10.3847/1538-4357/ad2ea9⟩. ⟨hal-04566052⟩
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