Magnetic Helicity and Free Magnetic Energy as Tools to Probe Eruptions in two Differently Evolving Solar Active Regions
arXiv:2301.08495 · doi:10.1051/0004-6361/202245631
Abstract
Using vector magnetograms from the HMI/SDO and a magnetic connectivity-based method, we calculate the instantaneous relative magnetic helicity and free magnetic energy budgets for several days in two solar active regions (ARs), AR11890 and AR11618, both with complex photospheric magnetic field configurations. The ARs produced several major eruptive flares while their photospheric magnetic field exhibited primarily flux decay in AR11890 and primarily flux emergence in AR11618. Throughout much of their evolution both ARs featured substantial budgets of free magnetic energy and of both positive and negative helicity. In fact, the imbalance between the signed components of their helicity was as low as in the quiet Sun and their net helicity eventually changed sign 14-19 hours after their last major flare. Despite such incoherence, the eruptions occurred at times of net helicity peaks that were co-temporal with peaks in the free magnetic energy. The losses associated with the eruptive flares in the normalized free magnetic energy were in the range 10-60%. For the helicity, changes ranged from 25% to the removal of the entire excess helicity of the prevailing sign, leading a roughly zero net helicity, but with significant equal and opposite budgets of both helicity senses. The removal of the slowly varying background component of the free energy and helicity timeseries revealed that all eruption-related peaks of both quantities exceeded the 2 levels of their detrended timeseries. There was no eruption when only one or none of these quantities exceeded its 2 level. Our results indicate that differently evolving ARs may produce major eruptive flares even when, in addition to the accumulation of significant free magnetic energy budgets, they accumulate large amounts of both negative and positive helicity without a strong dominance of one handedness over the other.
arXiv comment17 pages, 11 figures, accepted for publication in Astronomy & Astrophysics (abbreviated abstract)
References in corpus (68)
- A Model for Solar Coronal Mass Ejections
- Torus instability
- Confined and ejective eruptions of kink-unstable flux ropes
- The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
- The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
- Global Energetics of Thirty-Eight Large Solar Eruptive Events
- Evolution of Magnetic Field and Energy in A Major Eruptive Active Region Based on SDO/HMI Observation
- Observation of An Evolving Magnetic Flux Rope Prior To and During A Solar Eruption
- The origin, early evolution and predictability of solar eruptions
- Tracking Vector Magnetograms with the Magnetic Induction Equation
- Driving major solar flares and eruptions: a review
- Different Power-law Indices in the Frequency Distributions of Flares with and without Coronal Mass Ejections
- Photospheric flux cancellation and associated flux rope formation and eruption
- Direct Evidence for a Fast CME Driven by the Prior Formation and Subsequent Destabilization of a Magnetic Flux Rope
- Combined STEREO/RHESSI study of CME acceleration and particle acceleration in solar flares
- The Confined X-class Flares of Solar Active Region 2192
- Eruption of magnetic flux ropes during flux emergence
- The Driver of Coronal Mass Ejections in the Low Corona: A Flux Rope
- Origin and Structures of Solar Eruptions I: Magnetic Flux Rope (Invited Review)
- Magnetic Field Confinement in the Corona: The Role of Magnetic Helicity Accumulation
- Flux Rope Formation Preceding Coronal Mass Ejection Onset
- Relative magnetic helicity as a diagnostic of solar eruptivity
- On the Formation of Active Regions
- The Magnetic Topology of Coronal Mass Ejection sources
- The Magnetic Energy - Helicity Diagram of Solar Active Regions
- Interpreting Eruptive Behavior in NOAA AR 11158 via the Region's Magnetic Energy and Relative Helicity Budgets
- The Origin of Major Solar Activity - Collisional Shearing Between Nonconjugated Polarities of Multiple Bipoles Emerging Within Active Regions
- Global Energetics of Solar Flares: I. Magnetic Energies
- Magnetic Energy and Helicity Budgets in the Active-Region Solar Corona. II. Nonlinear Force-Free Approximation
- Non-neutralized Electric Current Patterns in Solar Active Regions: Origin of the Shear-Generating Lorentz Force
- Magnetic helicity estimations in models and observations of the solar magnetic field. Part I: Finite volume methods
- Using Coronal Loops to Reconstruct the Magnetic Field of an Active Region Before and After a Major Flare
- Productivity of Solar Flares and Magnetic Helicity Injection in Active Regions
- Testing magnetic helicity conservation in a solar-like active event
- The variation of relative magnetic helicity around major flares
- Simulation of Flux Emergence from the Convection Zone to the Corona
- Validation and Benchmarking of a Practical Free Magnetic Energy and Relative Magnetic Helicity Budget Calculation in Solar Magnetic Structures
- Magnetic helicity budget of solar active regions prolific of eruptive and confined flares
- 3D MHD Flux Emergence Experiments: Idealized models and coronal interactions
- Flux cancellation and the evolution of the eruptive filament of 2011 June 7
- Magnetic helicity and energy budget around large confined and eruptive solar flares
- Magnetic Energy and Helicity Budgets in the Active-Region Solar Corona. I. Linear Force-Free Approximation
- Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part III: Twist Number Method
- First nonlinear force-free field extrapolations of SOLIS/VSM data
- Magnetic helicity and eruptivity in active region 12673
- Buildup of Magnetic Shear and Free Energy During Flux Emergence and Cancellation
- Photospheric Injection of Magnetic Helicity: Connectivity--based Flux Density Method
- Successive Homologous Coronal Mass Ejections driven by shearing and converging motions in solar active region NOAA 12371
- Time variations of the non-potential and volume-threading magnetic helicities
- The role of flux cancellation in eruptions from bipolar active regions
- Solar Flare-CME Coupling Throughout Two Acceleration Phases of a Fast CME
- Successive Injection of Opposite Magnetic Helicity in Solar Active Region NOAA 11928
- When do solar erupting hot magnetic flux ropes form?
- Recurring Homologous Solar Eruptions in NOAA AR 11429
- Magnetic helicity and energy of emerging solar active regions and their erruptivity
- Magnetic Helicity of Self-Similar Axisymmetric Force-free Fields
- Relative field-line helicity in bounded domains
- Magnetic helicity estimations in models and observations of the solar magnetic field. Part IV: Application to solar observations
- Extended statistical analysis of emerging solar active regions
- Degree of electric current neutralization and the activity in solar Active Regions
- Differences in periodic magnetic helicity injection behaviour between flaring and non-flaring Active Regions: Case Study
- Near-Sun and 1 AU magnetic field of coronal mass ejections: A parametric study
- Relative field line helicity of a large eruptive solar active region
- Studying the transfer of magnetic helicity in solar active regions with the connectivity-based helicity flux density method
- Successive Injection of Opposite Magnetic Helicity: Evidence for Active Regions without Coronal Mass Ejections
- Energy and helicity budgets of solar quiet regions
- Energy and helicity fluxes in line-tied eruptive simulations
- Nature of helicity injection in non-erupting solar active regions