Two-step solar filament eruptions |
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Boris Filippov Submitted: 2017-12-25 00:35
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.
Authors: B. Filippov
Projects: None
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Publication Status: Accepted for publication in MNRAS
Last Modified: 2017-12-25 23:52
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