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
On the relationship between ELM filaments and solar flares
TL;DR: In this paper, the dynamical evolution of solar flares and edge localized modes (ELM) is separately reviewed, after which the relationship between the two phenomena is examined, and four families of dynamical theories of ELM filament evolution, classified according to the electric field ordering and the absence/presence of magnetic reconnection at the X point, are compared with experimental measurements on tokamaks.
Journal ArticleDOI
Flux rope acceleration and enhanced magnetic reconnection rate
TL;DR: In this article, a physical mechanism of flares has emerged from 2.5-dimensional resistive MHD simulations of the dynamical evolution of current sheet formation and magnetic reconnection and flux rope acceleration subject to the continuous, slow increase of magnetic shear in the arcade.
Journal ArticleDOI
A Model of Solar Flares and Their Homologous Behavior
G. S. Choe,Chio-Zong Cheng +1 more
TL;DR: In this article, a model describing the physical processes of solar flares and their homologous behavior is presented based on resistive MHD simulations of magnetic arcade evolution subject to continuous shear-increasing footpoint motions.
Journal ArticleDOI
The birth of a coronal mass ejection
Tingyu Gou,Tingyu Gou,Tingyu Gou,Rui Liu,Rui Liu,Bernhard Kliem,Bernhard Kliem,Yuming Wang,Yuming Wang,Astrid Veronig +9 more
TL;DR: In this article, the authors present an observation of how a stellar-sized CME bubble evolves continuously from plasmoids, mini flux ropes that are barely resolved, within half an hour.
Journal ArticleDOI
Numerical Study on Emergence of Kinked Flux Tube for Understanding of Possible Origin of Delta-spot Regions
TL;DR: In this paper, the authors carried out a magnetohydrodynamics simulation where a subsurface twisted kink-unstable flux tube emerges from the solar interior to the corona and formed a complex quadrupole structure at the photosphere.
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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