Journal ArticleDOI
A Model for Solar Coronal Mass Ejections
TLDR
In this article, a magnetic breakout model for the initiation of a solar coronal mass ejection (CME) was proposed, where reconnection between a sheared arcade and neighboring flux systems triggers the eruption.Abstract:
We propose a new model for the initiation of a solar coronal mass ejection (CME). The model agrees with two properties of CMEs and eruptive flares that have proved to be very difficult to explain with previous models: (1) very low-lying magnetic field lines, down to the photospheric neutral line, can open toward infinity during an eruption; and (2) the eruption is driven solely by magnetic free energy stored in a closed, sheared arcade. Consequently, the magnetic energy of the closed state is well above that of the posteruption open state. The key new feature of our model is that CMEs occur in multipolar topologies in which reconnection between a sheared arcade and neighboring flux systems triggers the eruption. In this "magnetic breakout" model, reconnection removes the unsheared field above the low-lying, sheared core flux near the neutral line, thereby allowing this core flux to burst open. We present numerical simulations that demonstrate our model can account for the energy requirements for CMEs. We discuss the implication of the model for CME/flare prediction.read more
Citations
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Journal ArticleDOI
Eruption of Solar Magnetic Flux Ropes Caused by Flux Feeding
TL;DR: In this paper, the authors carried out 2.5-dimensional magnetohydrodynamic (MHD) numerical simulations to investigate whether the flux-feeding mechanism can explain solar magnetic flux ropes.
Journal ArticleDOI
An MHD Model of the December 13 2006 Eruptive Flare
TL;DR: In this article, a 3D MHD simulation is presented to qualitatively model the coronal magnetic field evolution associated with the eruptive flare that occurred on December 13, 2006 in the emerging delta-sunspot region NOAA 10930 observed by the Hinode satellite.
Journal ArticleDOI
Multiwavelength Observations of a Slow-rise, Multistep X1.6 Flare and the Associated Eruption
Vasyl Yurchyshyn,Vasyl Yurchyshyn,Pankaj Kumar,Kyung-Suk Cho,Kyung-Suk Cho,Eun-Kyung Lim,V. Abramenko +6 more
TL;DR: In this paper, the authors studied a slow rise, multi-step X1.6 flare that began on November 7, 2014 as a localized eruption of core fields inside a δ-sunspot and later engulfed the entire active region.
Journal ArticleDOI
Side Magnetic Reconnections Induced by Coronal Mass Ejections: Observations and Simulations
TL;DR: In this paper, a series of small-scale side eruptions that occurred during and after a large-scale CME was investigated, and it was shown that a CME can be associated not only with a single reconnection process, but also with many other side reconnections occurring at different locations and times around the main flux rope.
Book ChapterDOI
Current Status of MHD Simulations for Space Weather
TL;DR: In this article, the authors review the status of the art of 3D time-dependent magnetohydrodynamic (MHD) models of solar wind and highlight the influence of adverse space weather conditions by presenting the Halloween Sun-Earth events and their associated effects in the terrestrial space.
References
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Journal ArticleDOI
The solar flare myth
TL;DR: In this paper, the authors outline a different paradigm of cause and effect that removes solar flares from their central position in the chain of events leading from the Sun to near-Earth space.
Journal ArticleDOI
Disruption of Coronal Magnetic Field Arcades
Zoran Mikic,Jon A. Linker +1 more
TL;DR: In this paper, the magnetic field expands outward in a process that opens the field lines and produces a tangential discontinuity, leading to an impulsive release of magnetic energy, fast flows, and the ejection of a plasmoid.
Journal ArticleDOI
Coronal mass ejections - 1979-1981
TL;DR: An overview of observations of coronal mass ejections (CMEs) during the interval March 28, 1979 through December 31, 1981 is presented in this paper, where an introduction is provided to the instrument used in the observations, the method of identifying CMEs, the concepts of CME structural classes, CME importance categories, and the distribution of mass ejection among these classes and categories.
Journal ArticleDOI
On some properties of force-free magnetic fields in infinite regions of space
TL;DR: In this article, a priori inequalities are defined which must be satisfied by the force-free equations, and upper bounds for the magnetic energy of the region provided the value of the magnetic normal component at the boundary of a region can be shown to decay sufficiently fast at infinity.
Journal ArticleDOI
Force-free magnetic fields - The magneto-frictional method
TL;DR: In this article, a magneto-frictional method was proposed to calculate magnetic field configurations in which the Lorentz force j x B is everywhere zero, subject to specified boundary conditions.
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