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
Global budget for an eruptive active region - I. Equilibrium reconstruction approach
TL;DR: In this article, the magnetic structure of the active region #7912 was reconstructed using vector magnetograms from the Imaging Vector Magnetograph (IVM), assuming it is in a non-linear force-free state.
Journal ArticleDOI
A kinematically distorted flux rope model for magnetic clouds
TL;DR: In this article, a non-circular cross-section flux rope model is proposed to model the magnetic field in the low corona of CMEs/ICMEs and the physical processes acting on the magnetic cloud.
Book
Particle Acceleration and Kinematics in Solar Flares
TL;DR: In this article, the physical processes of particle acceleration, injection, propagation, trapping, and energy loss in solar flare conditions are reviewed, and the authors aim to capitalize on the numerous observations from recent spacecraft missions, such as from the Compton Gamma Ray Observatory (CGRO), the Yohkoh Hard X-Ray Telescope (HXT) and Soft X-ray Telescope (SXT), and the Transition Region and Coronal Explorer (TRACE), to interpret the detailed timing and spectral evolution of the radiative signatures caused by nonthermal particles in hard X-rays
Journal ArticleDOI
How did a major confined flare occur in super solar active region 12192
Chaowei Jiang,Chaowei Jiang,S. T. Wu,Vasyl Yurchyshyn,Vasyl Yurchyshyn,Haiming Wang,Xueshang Feng,Qiang Hu +7 more
TL;DR: In this paper, the authors studied the physical mechanism of a major X-class solar flare that occurred in the super NOAA active region (AR) 12192 using a data-driven numerical magnetohydrodynamic (MHD) modeling complemented with observations.
Journal ArticleDOI
Astrophysics in 2003
TL;DR: In this paper, five coherent sections address solar physics, cosmology with WMAP highlights, gamma-ray bursters, extra-solar-system planets, and the formation and evolution of galaxies (from reionization to assemblage of Local Group galaxies).
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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