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
The X17.2 flare occurred in NOAA 10486: an example of filament destabilization caused by a domino effect
Francesca Zuccarello,Paolo Romano,František Fárník,Marian Karlicky,L. Contarino,V. Battiato,Salvo L. Guglielmino,M. Comparato,Ignacio Ugarte-Urra +8 more
TL;DR: In this paper, the authors analyzed the relationship between the pre-flare and flare phases and determine which model is the most suitable for interpreting this event, and determined the temporal sequence of events occurring before and during the X17.2 flare and the magnetic field configuration in the linear force-free field approximation.
Catastrophe versus instability for the eruption of a toroidal
TL;DR: In this paper, the onset of a solar eruption is formulated as either a magnetic catastrophe or as an instability, both starting with the same equation of force balance governing the underlying equilibria.
Journal ArticleDOI
A Coupled Model for the Emergence of Active Region Magnetic Flux into the Solar Corona
TL;DR: In this paper, the authors present a set of numerical simulations that model the emergence of active region magnetic flux into an initially field-free model corona, showing that time-dependent subsurface flows are an important component of the dynamic evolution and subsequent morphology of an emerging magnetic structure.
Journal ArticleDOI
Current Sheets, Plasmoids and Flux Ropes in the Heliosphere. Part I. 2-D or not 2-D? General and Observational Aspects
Olga Khabarova,Olga Malandraki,Helmi Malova,Roman Kislov,A. Greco,Roberto Bruno,Oreste Pezzi,Sergio Servidio,Gang Li,William H. Matthaeus,J. A. le Roux,N. E. Engelbrecht,F. Pecora,Lev Zelenyi,V. N. Obridko,V. D. Kuznetsov +15 more
TL;DR: A review of the evolution of views on processes related to current sheets, plasmoids, blobs and flux ropes of various scales and origins in the heliosphere can be found in this article.
Journal ArticleDOI
The Grad-Shafranov reconstruction in twenty years: 1996–2016
TL;DR: In this article, the authors review and summarize the applications of the Grad-Shafranov (GS) reconstruction technique to space plasma structures in the Earth's magnetosphere and in the interplanetary 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.
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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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