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
Simulation of a Breakout Coronal Mass Ejection in the Solar Wind
TL;DR: In this paper, the initiation and evolution of coronal mass ejections (CMEs) is studied by means of the breakout model embedded in a 2.5D axisymmetric solar wind in the framework of numerical magnetohydrodynamics.
Journal ArticleDOI
Parker Solar Probe In Situ Observations of Magnetic Reconnection Exhausts during Encounter 1
Tai Phan,Stuart D. Bale,Stuart D. Bale,Jonathan Eastwood,Benoit Lavraud,James Drake,Marit Øieroset,Michael Shay,Marc Pulupa,Michael L. Stevens,Robert J. MacDowall,Anthony W. Case,Davin Larson,Justin C. Kasper,Phyllis Whittlesey,A. Szabo,Kelly E. Korreck,John W. Bonnell,T. Dudok de Wit,Keith Goetz,Peter Harvey,Timothy S. Horbury,Roberto Livi,David M. Malaspina,Kristoff Paulson,N.-E. Raouafi,Marco Velli +26 more
TL;DR: In this paper, the authors performed a comprehensive survey of current sheets and found evidence for 21 reconnection exhausts, which were observed in heliospheric current sheets, coronal mass ejections, and regular solar wind.
Journal ArticleDOI
Astrophysics in 2000
TL;DR: The year 2000 as discussed by the authors was a year in which some topics selected themselves as important through the sheer numbers of papers published, including the connection(s) between galaxies with active central engines and galaxies with starbursts, the transition from asymptotic giant branch stars to white dwarfs, gamma-ray bursters, solar data from three major satellite missions, and the cosmological parameters, including dark matter and very large scale structure.
Journal ArticleDOI
On the Relationship Between a Hot-channel-like Solar Magnetic Flux Rope and its embedded Prominence
Xin Cheng,Xin Cheng,Mingde Ding,Jie Zhang,Jie Zhang,Abhishek K. Srivastava,Yang Guo,Pengfei Chen,J. Q. Sun +8 more
TL;DR: In this paper, the authors investigated the relationship between the hot-channel and associated prominence through analyzing a limb event on 2011 September 12, and concluded that the hot channel is most likely the magnetic flux rope (MFR) system and the prominence only corresponds to the cool materials that are collected in the bottom of the helical field lines of the MFR against the gravity.
Journal ArticleDOI
Magnetic Reconnection Models of Prominence Formation
TL;DR: In this paper, the authors simulate coronal magnetic field evolution when two flux systems are driven together by boundary motions, and find that reconnection proceeds very weakly, if at all, in configurations driven with global shear flows (i.e., differential rotation), while reconnection is much more efficiently in similar configurations that are driven to collide directly, with converging motions along the neutral line that lead to flux cancellation.
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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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
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