Sausage instabilities on top of kinking lengthening current-carrying magnetic flux tubes

von der Linden, Jens; You, Setthivoine

doi:10.1063/1.4981231

Sausage instabilities on top of kinking lengthening current-carrying magnetic flux tubes

Journal Article · Mon Apr 24 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4981231· OSTI ID:1465760

^[1]; You, Setthivoine ^[2]

Univ. of Washington, Seattle, WA (United States); Univ Washington, Seattle, WA 98195 USA
Univ. of Washington, Seattle, WA (United States)

We theoretically explore the possibility of sausage instabilities developing on top of a kink instability in lengthening current-carrying magnetic flux tubes. Observations indicate that the dynamics of magnetic flux tubes in our cosmos and terrestrial experiments can involve topological changes faster than time scales predicted by resistive magnetohydrodynamics. Recent laboratory experiments suggest that hierarchies of instabilities, such as kink and Rayleigh-Taylor, could be responsible for initiating fast topological changes by locally accessing two-fluid and kinetic regimes. Sausage instabilities can also provide this coupling mechanism between disparate scales. Flux tube experiments can be classified by the flux tube's evolution in a configuration space described by a normalized inverse aspect-ratio $$\bar{k}$$ and current-to-magnetic flux ratio $$\bar{λ}$$. A lengthening current-carrying magnetic flux tube traverses this $$\bar{k}$$-$$\bar{λ}$$ space and crosses stability boundaries. We derive a single general criterion for the onset of the sausage and kink instabilities in idealized magnetic flux tubes with core and skin currents. The criterion indicates a dependence of the stability boundaries on current profiles and shows overlapping kink and sausage unstable regions in the $$\bar{k}$$-$$\bar{λ}$$ space with two free parameters. Finally, numerical investigation of the stability criterion reduces the number of free parameters to a single one that describes the current profile and confirms the overlapping sausage and kink unstable regions in $$\bar{k}$$-$$\bar{λ}$$ A lengthening, ideal current-carrying magnetic flux tube can therefore become sausage unstable after it becomes kink unstable.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-06OR23100; SC0010340

OSTI ID:: 1465760

Alternate ID(s):: OSTI ID: 1361833

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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