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
Three‐dimensional and twisted: An MHD interpretation of on‐disk observational characteristics of coronal mass ejections
Sarah Gibson,B. C. Low +1 more
TL;DR: In this paper, a physical interpretation of observed coronal “on-disk” manifestations of an Earth-directed coronal mass ejection (CME) is presented, by comparing the limb and on-disk CME representations of an analytic 3D MHD model based on a spheromak-type flux rope magnetic field configuration.
Journal ArticleDOI
Companion event and precursor of the x17 flare on 28 october 2003
Cristina Hemilse Mandrini,Pascal Démoulin,Brigitte Schmieder,Edward E. DeLuca,E. Pariat,Wahab Uddin +5 more
TL;DR: In this article, the authors focus on the analysis of magnetic field (SOHO/MDI), chromospheric (NainiTal observatory and TRACE) and coronal (TRACE) data obtained before and during the 28 October event.
Journal ArticleDOI
Coronal Mass Ejections over Solar Cycles 23 and 24
Philippe Lamy,Olivier Floyd,Brice Boclet,Julien Wojak,Hugo Gilardy,T. Barlyaeva,T. Barlyaeva +6 more
TL;DR: In this article, the authors present a statistical analysis of solar coronal mass ejections (CMEs) based on 23 years of quasi-continuous observations with the LASCO coronagraph, thus covering two complete Solar Cycles (23 and 24).
Journal ArticleDOI
Decoding the Pre-Eruptive Magnetic Field Configurations of Coronal Mass Ejections
Spiros Patsourakos,Angelos Vourlidas,Tibor Torok,Bernhard Kliem,Spiro K. Antiochos,Vasilis Archontis,Guillaume Aulanier,Xin Cheng,Georgios Chintzoglou,Manolis K. Georgoulis,Lucie M. Green,James E. Leake,Ronald L. Moore,Alexander Nindos,P. Syntelis,Stephanie L. Yardley,Vasyl Yurchyshyn,Jie Zhang +17 more
TL;DR: In this article, the authors proposed that the combination of multi-viewpoint multi-thermal coronal observations and multi-height vector magnetic field measurements is the optimal approach for resolving the issue conclusively and demonstrate the approach using MHD simulations and synthetic coronal images.
Journal ArticleDOI
Direct observations of magnetic flux rope formation during a solar coronal mass ejection
TL;DR: In this paper, the authors present an intriguing observation of a solar eruptive event that occurred on 2013 November 21 with the Atmospheric Imaging Assembly on board the Solar Dynamic Observatory, which shows the formation process of the magnetic flux ropes (MFRs) during the eruption in detail.
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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