A Prospective New Diagnostic Technique for Distinguishing Eruptive and Non-Eruptive Active Regions

Abstract

Active regions are the source of the majority of magnetic flux rope ejections that become Coronal Mass Ejections (CMEs). To identify in advance which active regions will produce an ejection is key for both space weather prediction tools and future science missions such as Solar Orbiter. The aim of this study is to develop a new technique to identify which active regions are more likely to generate magnetic flux rope ejections. The new technique will aim to: (i) produce timely space weather warnings and (ii) open the way to a qualified selection of observational targets for space-borne instruments. We use a data-driven Non-linear Force-Free Field (NLFFF) model to describe the 3D evolution of the magnetic field of a set of active regions. We determine a metric to distinguish eruptive from non-eruptive active regions based on the Lorentz force. Furthermore, using a subset of the observed magnetograms, we run a series of simulations to test whether the time evolution of the metric can be predicted. The identified metric successfully differentiates active regions observed to produce eruptions from the non-eruptive ones in our data sample. A meaningful prediction of the metric can be made between 6 to 16 hours in advance. This initial study presents an interesting first step in the prediction of CME onset using only LOS magnetogram observations combined with NLFFF modelling. Future studies will address how to generalise the model such that it can be used in a more operational sense and for a variety of simulation approaches.

References in corpus (19)

• Confined and ejective eruptions of kink-unstable flux ropes
• Understanding space weather to shield society: A global road map for 2015-2025 commissioned by COSPAR and ILWS
• The Sun's Global Photospheric and Coronal Magnetic Fields: Observations and Models
• Forecasting Solar Flares Using Magnetogram-based Predictors and Machine Learning
• Critical decay index at the onset of solar eruptions
• Modeling the Dispersal of an Active Region: Quantifying Energy Input into the Corona
• Direct observations of magnetic flux rope formation during a solar coronal mass ejection
• An Observationally-Constrained Model of a Flux Rope that Formed in the Solar Corona
• Study the build-up, initiation and acceleration of 2008 April 26 coronal mass ejection observed by STEREO
• The eruption of a small-scale emerging flux rope as the driver of an M-class flare and a coronal mass ejection
• Is flux rope a necessary condition for the progenitor of coronal mass ejections?
• Simulating the Coronal Evolution of AR 11437 using SDO/HMI Magnetograms
• Comparison of a Global Magnetic Evolution Model with Observations of Coronal Mass Ejections
• Origin and Ion Charge State Evolution of Solar Wind Transients during 4 -- 7 August 2011
• The role of flux cancellation in eruptions from bipolar active regions
• Simulating AIA observations of a flux rope ejection
• Magnetic Flux Rope Identification and Characterization from Observationally-Driven Solar Coronal Models
• Effect of gravitational stratification on the propagation of a CME
• Earth-Affecting Solar Causes Observatory (EASCO): A mission at the Sun-Earth L5

Cited by in corpus (5)

• The characteristics of flare- and CME-productive solar active regions
• Simulating the Coronal Evolution of Bipolar Active Regions to Investigate the Formation of Flux Ropes
• Determining the source and eruption dynamics of a stealth CME using NLFFF modelling and MHD simulations
• A New Space Weather Tool for Identifying Eruptive Active Regions
• Signature and escape of highly fractionated plasma in an active region