Electric-Current Neutralization, Magnetic Shear, and Eruptive Activity in Solar Active Regions

Abstract

The physical conditions that determine whether or not solar active regions (ARs) produce strong flares and coronal mass ejections (CMEs) are not yet well understood. Here we investigate the association between electric-current neutralization, magnetic shear along polarity inversion lines (PILs), and eruptive activity in four ARs; two emerging and two well-developed ones. We find that the CME-producing ARs are characterized by a strongly non-neutralized total current, while the total current in the ARs that did not produce CMEs is almost perfectly neutralized. The difference in the PIL-shear between these two groups is much less pronounced, which suggests that the degree of current-neutralization may serve as a better proxy for assessing the ability of ARs to produce CMEs.

arXiv commentApJL in press

References in corpus (22)

• Torus instability
• Physics of Solar Prominences: II - Magnetic Structure and Dynamics
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
• Optimization code with weighting function for the reconstruction of coronal magnetic fields
• Evolution of Magnetic Field and Energy in A Major Eruptive Active Region Based on SDO/HMI Observation
• Why Is the Great Solar Active Region 12192 Flare-Rich But CME-Poor?
• Generalized Squashing Factors for Covariant Description of Magnetic Connectivity in the Solar Corona
• Electric current in flares ribbons: observations and 3D standard model
• The Confined X-class Flares of Solar Active Region 2192
• Magnetic Topology of Coronal Hole Linkages
• Simulations of Emerging Magnetic Flux. I: The Formation of Stable Coronal Flux Ropes
• Distribution of Electric Currents in Solar Active Regions
• Non-neutralized Electric Current Patterns in Solar Active Regions: Origin of the Shear-Generating Lorentz Force
• A spatio-temporal description of the abrupt changes in the photospheric magnetic and Lorentz-force vectors during the 2011 February 15 X2.2 flare
• The Relationship between the Sudden Change of the Lorentz Force and the Magnitude of Associated Flares
• Evolution of Currents of Opposite Signs in the Flare Productive Solar Active Region NOAA 10930
• Propagation of the 2012 March Coronal Mass Ejections from the Sun to Heliopause
• On the Characteristics of Footpoints of Solar Magnetic Flux Ropes during the Eruption
• The Magnetic Field of Active Region 11158 During the 2011 February 12-17 Flares : Differences between Photospheric Extrapolation and Coronal Forward-Fitting Methods
• The origin of net electric currents in solar active regions
• On the Absence of Photospheric Net Currents in Vector Magnetograms of Sunspots Obtained From Hinode (SOT/SP)
• Flux Emergence in the Solar Active Region NOAA 11158: The Evolution of Net Current

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• Flare-productive active regions
• Black Hole Mergers From Globular Clusters Observable by LISA I: Eccentric Sources Originating From Relativistic $N$-body Dynamics
• Decoding the Pre-Eruptive Magnetic Field Configurations of Coronal Mass Ejections
• Magnetic Flux Ropes in the Solar Corona: Structure and Evolution toward Eruption
• Magnetohydrodynamic Simulation of the X9.3 Flare on 2017 September 6: Evolving Magnetic Topology
• The role of non-axisymmetry of magnetic flux rope in constraining solar eruptions
• Evolution of A Magnetic Flux Rope toward Eruption
• Very fast helicity injection leading to critically stable state and large eruptive activity in solar active region NOAA 12673
• Electric Current Neutralization in Solar Active Regions and Its Relation to Eruptive Activity
• Toward Improved Understanding of Magnetic Fields Participating in Solar Flares: Statistical Analysis of Magnetic Field within Flare Ribbons
• Recurring Homologous Solar Eruptions in NOAA AR 11429
• The Role of Twist in Kinked Flux Rope Emergence and Delta-Spot Formation
• Degree of electric current neutralization and the activity in solar Active Regions
• Investigating pre-eruptive magnetic properties at the footprints of erupting magnetic flux ropes
• Distributed Electric Currents in Solar Active Regions
• Formation and eruption of sigmoidal structure from a weak field region of NOAA 11942
• What Are the Causes of Super Activity of Solar Active Regions?
• The extremely strong non-neutralized electric currents of the unique solar active region NOAA 13664
• Electric Currents through J-shaped and Non-J-shaped Flare Ribbons
• Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties
• Non-Neutralized Electric Current of Active Regions Explained as a Projection Effect
• Confinedness of an X3.1 class solar flare occurred in NOAA 12192: Analysis from multi-instruments observations
• Decipher the Three-Dimensional Magnetic Topology of a Great Solar Flare