Evidence for the Magnetic Breakout Model in an Equatorial Coronal-hole Jet

Small, impulsive jets commonly occur throughout the solar corona, but are especially visible in coronal holes. Evidence is mounting that jets are part of a continuum of eruptions that extends to much larger coronal mass ejections and eruptive flares. Because coronal-hole jets originate in relatively...

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Bibliographic Details
Published in:The Astrophysical journal 2018-02, Vol.854 (2), p.155
Main Authors: Kumar, Pankaj, Karpen, Judith T., Antiochos, Spiro K., Wyper, Peter F., DeVore, C. Richard, DeForest, Craig E.
Format: Article
Language:English
Subjects:
Astrophysics
Corona
Coronal holes
Coronal mass ejection
Energy storage
Eruptions
Free energy
Jets
Polarity
Solar activity
Solar corona
Solar observatories
Sun: corona
Sun: filaments, prominences
Sun: flares
Sun: magnetic fields
Sun: UV radiation
Topology
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Summary:Small, impulsive jets commonly occur throughout the solar corona, but are especially visible in coronal holes. Evidence is mounting that jets are part of a continuum of eruptions that extends to much larger coronal mass ejections and eruptive flares. Because coronal-hole jets originate in relatively simple magnetic structures, they offer an ideal testbed for theories of energy buildup and release in the full range of solar eruptions. We analyzed an equatorial coronal-hole jet observed by the Solar Dynamics Observatory (SDO)/AIA on 2014 January 9 in which the magnetic-field structure was consistent with the embedded-bipole topology that we identified and modeled previously as an origin of coronal jets. In addition, this event contained a mini-filament, which led to important insights into the energy storage and release mechanisms. SDO/HMI magnetograms revealed footpoint motions in the primary minority-polarity region at the eruption site, but show negligible flux emergence or cancellation for at least 16 hr before the eruption. Therefore, the free energy powering this jet probably came from magnetic shear concentrated at the polarity inversion line within the embedded bipole. We find that the observed activity sequence and its interpretation closely match the predictions of the breakout jet model, strongly supporting the hypothesis that the breakout model can explain solar eruptions on a wide range of scales.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aaab4f