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
In Situ Signatures of Interchange Reconnection between Magnetic Clouds and Open Magnetic Fields: A Mechanism for the Erosion of Polar Coronal Holes?
TL;DR: In this article, a method to determine the direction of solar open flux transport that results from the opening of magnetic clouds (MCs) by interchange reconnection at the Sun based solely on in-situ observations is presented.
Journal ArticleDOI
Magnetic Energy Buildup for Relativistic Magnetar Giant Flares
TL;DR: In this article, a general relativistic model of a magnetar magnetosphere endowed with strong magnetic fields was constructed and the equilibrium states of the stationary, axisymmetric magnetic fields were obtained as solutions of the Grad-Shafranov equation in a Schwarzschild spacetime.
Journal ArticleDOI
Maximizing magnetic energy storage in the solar corona
TL;DR: In this article, the authors explored energy storage in large-scale dipolar and related bipolar magnetic fields and showed that magnetic energy storage is enhanced when a nonpotential field is surrounded by a strong overlying potential field that acts to hold down the magnetic flux as its magnetic energy increases.
Journal ArticleDOI
Regarding the detectability and measurement of coronal mass ejections
TL;DR: In this paper, the authors discuss the problems associated with the detection and measurement of coronal mass ejections (CMEs) using visible white light imagers (coronagraphs and heliospheric imagers).
Journal ArticleDOI
Trigger of Successive Filament Eruptions Observed by SDO and STEREO
Sajal Kumar Dhara,Sajal Kumar Dhara,Ravindra Belur,Pankaj Kumar,Pankaj Kumar,Ravinder K. Banyal,Shibu K. Mathew,Bhuwan Joshi +7 more
TL;DR: In this article, the mechanism of two successive eruptions (F1 and F2) of a filament in active region NOAA 11444 on 27 March 2012 was investigated using multiwavelength observations from the Solar Dynamics Observatory (SDO) and the Solar Terrestrial Relations Observatory (STEREO).
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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