Two-step solar filament eruptions
arXiv:1712.08173 · doi:10.1093/mnras/stx3277
Abstract
Coronal mass ejections (CMEs) are closely related to eruptive filaments and usually are the continuation of the same eruptive process into the upper corona. There are failed filament eruptions when a filament decelerates and stops at some greater height in the corona. Sometimes the filament after several hours starts to rise again and develops into the successful eruption with a CME formation. We propose a simple model for the interpretation of such two-step eruptions in terms of equilibrium of a flux rope in a two-scale ambient magnetic field. The eruption is caused by a slow decrease of the holding magnetic field. The presence of two critical heights for the initiation of the flux-rope vertical instability allows the flux rope to stay after the first jump some time in a metastable equilibrium near the second critical height. If the decrease of the ambient field continues, the next eruption step follows.
8 pages, 5 figures, accepted for publication in MNRAS
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Cited by in corpus (7)
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- Sympathetic eruptions of two filaments with an identifiable causal link observed by the Solar Dynamics Observatory
- Where and how does a decay-index profile become saddle-like?
- Self-similar expansion model of cylindrical flux ropes combined with Alfven wave current system