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Reverse Current Model for Coronal Mass Ejection Cavity Formation View all abstracts by submitter

Magnus Albert Haw   Submitted: 2018-09-04 22:27

We report here a new model for explaining the three-part structure of coronal mass ejections (CMEs). The model proposes that the cavity in a CME forms because a rising electric current in the core prominence induces an oppositely directed electric current in the background plasma; this eddy current is required to satisfy the frozen-in magnetic flux condition in the background plasma. The magnetic force between the inner-core electric current and the oppositely directed induced eddy current propels the background plasma away from the core, creating a cavity and a density pileup at the cavity edge. The cavity radius saturates when an inward restoring force from magnetic and hydrodynamic pressure in the region outside the cavity edge balances the outward magnetic force. The model is supported by (i) laboratory experiments showing the development of a cavity as a result of the repulsion of an induced reverse current by a rising inner-core flux-rope current, (ii) 3D numerical magnetohydrodynamic (MHD) simulations that reproduce the laboratory experiments in quantitative detail, and (iii) an analytic model that describes cavity formation as a result of the plasma containing the induced reverse current being repelled from the inner core. This analytic model has broad applicability because the predicted cavity widths are relatively independent of both the current injection mechanism and the injection timescale.

Authors: Magnus A. Haw, Pakorn Wongwaitayakornkul, Hui Li, and Paul M. Bellan
Projects: None

Publication Status: ApJL (accepted)
Last Modified: 2018-09-05 12:43
Go to main E-Print page  Advances in mean-field dynamo theory and applications to astrophysical turbulence  Predictions of DKIST/DL-NIRSP Observations for an Off-limb Kink-unstable Coronal Loop  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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