The effect of data-driving and relaxation model on magnetic flux rope evolution and stability

Abstract

We investigate the effect of data-driving on flux rope eruptivity in magnetic field simulations by analysing fully data-driven modelling results of active region (AR) 12473 and AR11176, as well as preforming relaxation runs for AR12473 (found to be eruptive). Here, the driving is switched off systematically at different time steps. We analyse the behaviour of fundamental quantities, essential for understanding the eruptivity of magnetic flux ropes (MFRs). The data-driven simulations are carried out with the time-dependent magnetofrictional model (TMFM) for AR12473 and AR11176. For the relaxation runs, we employ the magnetofrictional method (MFM) and a zero-beta magnetohydrodynamic (MHD) model to investigate how significant the differences between the two relaxation procedures are when started from the same initial conditions. To determine the eruptivity of the MFRs, we calculate characteristic geometric properties, such as the cross-section, MFR height along with stability parameters, such as MFR twist and the decay index. For eruptive cases, we investigate the effect of sustained driving beyond the point of eruptivity on the MFR properties. We find that the fully-driven AR12473 MFR is eruptive while the AR11176 MFR is not. For the relaxation runs, we find that the MFM MFRs are eruptive when the driving is stopped around the flare time or later, while the MHD MFRs show eruptive behaviour even if the driving is switched off one and a half days before the flare occurs. We find that characteristic MFR properties can vary greatly even for the eruptive cases of different relaxation simulations. The results suggest that data driving can significantly influence the evolution of the eruption, with differences appearing even when the relaxation time is set to later stages of the simulation when the MFRs have already entered an eruptive phase.

Accepted for publication at A&A

References in corpus (14)

• Torus instability
• Ideal kink instability of a magnetic loop equilibrium
• Observations and modeling of the early acceleration phase of erupting filaments involved in coronal mass ejections
• Space Weather: From Solar Origins to Risks and Hazards Evolving in Time
• Solar Magnetic Flux Rope Eruption Simulated by a Data-Driven Magnetohydrodynamic Model
• The role of non-axisymmetry of magnetic flux rope in constraining solar eruptions
• The Sun and Space Weather
• The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
• Simulating the Coronal Evolution of AR 11437 using SDO/HMI Magnetograms
• Optimization of Photospheric Electric Field Estimates for Accurate Retrieval of Total Magnetic Energy Injection
• A Comparative Study of Solar Active Region 12371 with Data-constrained and Data-driven MHD Simulations
• A New Space Weather Tool for Identifying Eruptive Active Regions
• The Automatic Identification and Tracking of Coronal Flux Ropes -- Part I: Footpoints and Fluxes
• Effects of optimisation parameters on data-driven magnetofrictional modelling of active regions

Cited by in corpus (1)

• Formation and rising phase of a flux rope through data-constrained simulations