scholarly journals Simulation of sigmoid structure and filament eruption of AR11283 using a three-dimensional data-driven magnetohydrodynamic model

2013 ◽  
Vol 8 (S300) ◽  
pp. 466-467
Author(s):  
S. T. Wu ◽  
Chaowei Jiang ◽  
Xueshang Feng ◽  
Qiang Hu ◽  
Yang Liu
Keyword(s):  
Active Region ◽  
Three Dimensional ◽  
Flux Rope ◽  
Data Driven ◽  
Mhd Simulation ◽  
Filament Eruption ◽  
Linear Force ◽  
Simulation Results ◽  
Magnetohydrodynamic Model ◽  
Region Evolution

AbstractThis paper describes an MHD simulation of an observed Sigmoid in AR 11283 from its formation to eruption. The Non-linear Force Free MHD model (Jiang and Feng, 2012) and the data-driven active region evolution model (Wu et al., 2006; Jiang et al. 2013) together with the SDO/HMI magnetograms are used. We show the successful simulation results of the eruption of a flux-rope structure.

Data‐driven Magnetohydrodynamic Model for Active Region Evolution

2006 ◽  
Vol 652 (1) ◽  
pp. 800-811 ◽  
Author(s):  
S. T. Wu ◽  
A. H. Wang ◽  
Yang Liu ◽  
J. Todd Hoeksema
Keyword(s):  
Active Region ◽  
Data Driven ◽  
Magnetohydrodynamic Model ◽  
Region Evolution

scholarly journals Topological study of active region 11158

2013 ◽  
Vol 8 (S300) ◽  
pp. 479-480
Author(s):  
Jie Zhao ◽  
Hui Li ◽  
Etienne Pariat ◽  
Brigitte Schmieder ◽  
Yang Guo ◽  
...  
Keyword(s):  
Active Region ◽  
Magnetic Fields ◽  
Free Field ◽  
Three Dimensional ◽  
Projection Data ◽  
Solar Dynamics Observatory ◽  
Equal Area ◽  
Linear Force ◽  
Solar Dynamics ◽  
Force Free Field

AbstractWith the cylindrical equal area (CEA) projection data from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO), we reconstructed the three-dimensional (3D) magnetic fields in the corona, using a non-linear force-free field (NLFFF) extrapolation method every 12 minutes during five days, to calculate the squashing degree factor Q in the volume. The results show that this AR has an hyperbolic flux tube (HFT) configuration, a typical topology of quadrupole, which is stable even during the two large flares (M6.6 and X2.2 class flares).

scholarly journals Deriving the radial distances of wide coronal mass ejections from elongation measurements in the heliosphere – application to CME-CME interaction

2009 ◽  
Vol 27 (9) ◽  
pp. 3479-3488 ◽  
Author(s):  
N. Lugaz ◽  
A. Vourlidas ◽  
I. I. Roussev
Keyword(s):  
Coronal Mass Ejections ◽  
Three Dimensional ◽  
Flux Rope ◽  
Field Of View ◽  
Analytical Relationship ◽  
Momentum Exchange ◽  
Mhd Simulation ◽  
Angle Measurements ◽  
Simulation Based ◽  
Similar Sphere

Abstract. We present general considerations regarding the derivation of the radial distances of coronal mass ejections (CMEs) from elongation angle measurements such as those provided by SECCHI and SMEI, focusing on measurements in the Heliospheric Imager 2 (HI-2) field of view (i.e. past 0.3 AU). This study is based on a three-dimensional (3-D) magneto-hydrodynamics (MHD) simulation of two CMEs observed by SECCHI on 24–27 January 2007. Having a 3-D simulation with synthetic HI images, we are able to compare the two basic methods used to derive CME positions from elongation angles, the so-called "Point-P" and "Fixed-φ" approximations. We confirm, following similar works, that both methods, while valid in the most inner heliosphere, yield increasingly large errors in HI-2 field of view for fast and wide CMEs. Using a simple model of a CME as an expanding self-similar sphere, we derive an analytical relationship between elongation angles and radial distances for wide CMEs. This relationship is simply the harmonic mean of the "Point-P" and "Fixed-φ" approximations and it is aimed at complementing 3-D fitting of CMEs by cone models or flux rope shapes. It proves better at getting the kinematics of the simulated CME right when we compare the results of our line-of-sights to the MHD simulation. Based on this approximation, we re-analyze the J-maps (time-elongation maps) in 26–27 January 2007 and present the first observational evidence that the merging of CMEs is associated with a momentum exchange from the faster ejection to the slower one due to the propagation of the shock wave associated with the fast eruption through the slow eruption.

scholarly journals Shearing motions and torus instability in the 2010 April 3 filament eruption

2013 ◽  
Vol 8 (S300) ◽  
pp. 475-476
Author(s):  
F. P. Zuccarello ◽  
P. Romano ◽  
F. Zuccarello ◽  
S. Poedts
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Flux Rope ◽  
Active Region Noaa ◽  
Axial Field ◽  
Drift Motion ◽  
Filament Eruption ◽  
Onset Condition ◽  
Mass Ejection ◽  
The Magnetic Field

AbstractThe magnetic field evolution of active region NOAA 11059 is studied in order to determine the possible causes and mechanisms that led to the initiation of the 2010 April 3 coronal mass ejection (CME).We find (1) that the magnetic configuration of the active region is unstable to the torus instability and (2) that persistent shearing motions characterized the negative polarity, resulting in a southward, almost parallel to the meridians, drift motion of the negative magnetic field concentrations.We conclude that these shearing motions increased the axial field of the filament eventually bringing the flux rope axis to a height where the onset condition for the torus instability was satisfied.

scholarly journals Data-driven MHD Simulation of the Formation and Initiation of a Large-scale Preflare Magnetic Flux Rope in AR 12371

2020 ◽  
Vol 892 (1) ◽  
pp. 9 ◽  
Author(s):  
Wen He ◽  
Chaowei Jiang ◽  
Peng Zou ◽  
Aiying Duan ◽  
Xueshang Feng ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Large Scale ◽  
Flux Rope ◽  
Data Driven ◽  
Mhd Simulation ◽  
Magnetic Flux Rope

scholarly journals Solar Magnetic Flux Rope Eruption Simulated by a Data-driven Magnetohydrodynamic Model

2019 ◽  
Vol 870 (2) ◽  
pp. L21 ◽  
Author(s):  
Yang Guo ◽  
Chun Xia ◽  
Rony Keppens ◽  
M. D. Ding ◽  
P. F. Chen
Keyword(s):  
Magnetic Flux ◽  
Flux Rope ◽  
Data Driven ◽  
Magnetic Flux Rope ◽  
Magnetohydrodynamic Model

scholarly journals Reconstruction of the Coronal Magnetic Field for Active Region NOAA 8151

2001 ◽  
Vol 203 ◽  
pp. 441-443
Author(s):  
S. Régnier ◽  
T. Amari
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Magnetic Energy ◽  
Coronal Magnetic Field ◽  
X Rays ◽  
Active Region Noaa ◽  
Filament Eruption ◽  
Linear Force ◽  
Region Noaa ◽  
Field Lines

The active region NOAA 8151 observed between February 11–13, 1998 exhibits a filament eruption linked to the disappearance of a sigmoidal structure. Using vector magnetograms from IVM (Mees Observatory, Hawaii), we perform a non linear force-free reconstruction of the coronal magnetic field above this active region. This reconstruction allows to determine the distribution of electric currents, the magnetic energy and the relative magnetic helicity. The reconstructed magnetic field lines are compared to the soft X-rays (SXT, Yohkoh) observations.

scholarly journals Testing the Accuracy of Data-driven MHD Simulations of Active Region Evolution

2017 ◽  
Vol 838 (2) ◽  
pp. 113 ◽  
Author(s):  
James E. Leake ◽  
Mark G. Linton ◽  
Peter W. Schuck
Keyword(s):  
Active Region ◽  
Data Driven ◽  
Mhd Simulations ◽  
Region Evolution
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