Magnetic Connectivity between Active Regions 10987, 10988, and 10989 by Means of Nonlinear Force-Free Field Extrapolation
arXiv:1104.2246 · doi:10.1007/s11207-011-9764-z
Abstract
Extrapolation codes for modelling the magnetic field in the corona in cartesian geometry do not take the curvature of the Sun's surface into account and can only be applied to relatively small areas, \textit{e.g.}, a single active region. We apply a method for nonlinear force-free coronal magnetic field modelling of photospheric vector magnetograms in spherical geometry which allows us to study the connectivity between multi-active regions. We use vector magnetograph data from the Synoptic Optical Long-term Investigations of the Sun survey (SOLIS)/Vector Spectromagnetograph(VSM) to model the coronal magnetic field, where we study three neighbouring magnetically connected active regions (ARs: 10987, 10988, 10989) observed on 28, 29, and 30 March 2008, respectively. We compare the magnetic field topologies and the magnetic energy densities and study the connectivities between the active regions(ARs). We have studied the time evolution of magnetic field over the period of three days and found no major changes in topologies as there was no major eruption event. From this study we have concluded that active regions are much more connected magnetically than the electric current.
arXiv commentSolar Physics
References in corpus (12)
- Optimization code with weighting function for the reconstruction of coronal magnetic fields
- Preprocessing of vector magnetograph data for a non-linear force-free magnetic field reconstruction
- A Critical Assessment of Nonlinear Force-Free Field Modeling of the Solar Corona for Active Region 10953
- Nonlinear force-free modeling of the solar coronal magnetic field
- Computing nonlinear force-free fields in spherical geometry
- Free Magnetic Energy in Solar Active Regions above the Minimum-Energy Relaxed State
- An optimization principle for the computation of MHD equilibria in the solar corona
- A self-consistent nonlinear force-free solution for a solar active region magnetic field
- Nonlinear force-free magnetic field extrapolations: comparison of the Grad-Rubin and Wheatland-Sturrock-Roumeliotis algorithm
- Nonlinear force-free coronal magnetic field modelling and preprocessing of vector magnetograms in spherical geometry
- First nonlinear force-free field extrapolations of SOLIS/VSM data
- Nonlinear force-free field extrapolation in spherical geometry: improved boundary data treatment applied to a SOLIS/VSM vector magnetogram
Cited by in corpus (14)
- Evolution of Magnetic Field and Energy in A Major Eruptive Active Region Based on SDO/HMI Observation
- How to optimize nonlinear force-free coronal magnetic field extrapolations from SDO/HMI vector magnetograms?
- A New Implementation of the Magnetohydrodynamics-Relaxation Method for Nonlinear Force-Free Field Extrapolation in the Solar Corona
- Modeling Magnetic Field Structure of a Solar Active Region Corona using Nonlinear Force-Free Fields in Spherical Geometry
- A New Code for Nonlinear Force-Free Field Extrapolation of the Global Corona
- First use of synoptic vector magnetograms for global nonlinear force free coronal magnetic field models
- Full-disk nonlinear force-free field extrapolation of SDO/HMI and SOLIS/VSM magnetograms
- A Comparison Between Nonlinear Force-Free Field and Potential Field Models Using Full-Disk SDO/HMI Magnetogram
- Global Solar Free Magnetic Energy and Electric Current Density Distribution of Carrington Rotation 2124
- Optimizing Global Coronal Magnetic Field Models Using Image-Based Constraints
- Modeling coronal magnetic field using spherical geometry: cases with several active regions
- Effect of Size of the Computational Domain on Spherical Nonlinear Force-Free Modeling of Coronal Magnetic Field Using SDO/HMI Data
- Complex Magnetic Evolution and Magnetic Helicity in the Solar Atmosphere
- Coronal Magnetic Field Structure and Evolution for Flaring AR 11117 and its Surroundings