Resistive Instabilities and Solar Flares

1968 ◽  
Vol 1 (4) ◽  
pp. 152-153
Author(s):  
G. G. Lister
Keyword(s):  
Solar Flares ◽  
Finite Conductivity ◽  
Plasma Instabilities ◽  
Two Dimensional ◽  
Tearing Mode ◽  
Laboratory Plasmas ◽  
Initial Work

The study of plasma instabilities described by the inclusion of a finite conductivity in the hydromagnetic equations has aroused considerable interest since the initial work of Furth, Killeen and Rosenbluth for a two-dimensional geometry. In particular, the so-called ‘tearing’ mode, which has been observed in laboratory plasmas, has been suggested as a possible source of energy for solar flares.

scholarly journals Magnetic Reconnection with Sweet-Parker Characteristics in Two-dimensional Laboratory Plasmas

10.2172/3001 ◽  
1999 ◽  
Author(s):  
T. Carter ◽  
S. Hsu ◽  
H. Ji ◽  
R. Kulsrud ◽  
M. Yamada ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Two Dimensional ◽  
Laboratory Plasmas

scholarly journals Particle Orbits, Trapping, and Acceleration in a Filamentary Current Sheet Model

1994 ◽  
Vol 142 ◽  
pp. 719-728
Author(s):  
Bernhard Kliem
Keyword(s):  
Particle Acceleration ◽  
Electric Field ◽  
Test Particle ◽  
Solar Flares ◽  
Acceleration Of Particles ◽  
Acceleration Process ◽  
Two Dimensional ◽  
Magnetic Island ◽  
Particle Orbits ◽  
Island Dynamics

AbstractTest particle orbits in the two-dimensional Fadeev equilibrium with a perpendicular electric field added are analyzed to show that impulsive bursty reconnection, which has been proposed as a model for fragmentary energy release in solar flares, may account also for particle acceleration to (near) relativistic energies within a fraction of a second. The convective electric field connected with magnetic island dynamics can play an important role in the acceleration process.Subject headings: acceleration of particles — MHD — plasmas — Sun: corona — Sun: flares

scholarly journals Energetic particle acceleration and transport by Alfvén/acoustic waves in tokamak-like Solar flares

2010 ◽  
Vol 6 (S274) ◽  
pp. 162-164
Author(s):  
Martin Obergaulinger ◽  
Manuel García-Muñoz
Keyword(s):  
Solar Flares ◽  
Acoustic Waves ◽  
Energetic Particle ◽  
Fusion Plasmas ◽  
Experimental Phase ◽  
Astrophysical Plasmas ◽  
Energetic Ions ◽  
Laboratory Plasmas ◽  
Magnetically Confined ◽  
Particle Exchange

AbstractAlfven/acoustic waves are ubiquitous in astrophysical as well as in laboratory plasmas. Their interplay with energetic ions is of crucial importance to understanding the energy and particle exchange in astrophysical plasmas as well as to obtaining a viable energy source in magnetically confined fusion devices. In magnetically confined fusion plasmas, an experimental phase-space characterisation of convective and diffusive energetic particle losses induced by Alfven/acoustic waves allows for a better understanding of the underlying physics. The relevance of these results in the problem of the anomalous heating of the solar corona is checked by MHD simulations of Tokamak-like Solar flare tubes.

scholarly journals Multi-scale Observation and Data-driven Modeling of Magnetic Reconnection in Flaring Chromospheric Plasmas on the Sun

2021 ◽  
Author(s):  
Xiaoli Yan ◽  
Zhike Xue ◽  
Chaowei Jiang ◽  
Eric Priest ◽  
Bernhard Kliem ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Solar Flares ◽  
Data Driven ◽  
Multi Scale ◽  
Radiation Spectra ◽  
Laboratory Plasmas ◽  
Astrophysical Objects ◽  
Multiple Wavelengths ◽  
Resolution Imaging ◽  
Data Driven Modeling

Abstract Magnetic reconnection is a multi-faceted process of energy conversion in astrophysical, space and laboratory plasmas that operates at microscopic scales but has macroscopic drivers and consequences. Solar flares present a key laboratory for its study, leaving imprints of the microscopic physics in radiation spectra and allowing the macroscopic evolution to be imaged, yet a full observational characterization remains elusive. Here we combine high resolution imaging and spectral observations of a solar flare at multiple wavelengths with data-driven magnetohydrodynamic modeling to study the dynamics of the involved plasma from the current sheet to the plasmoid scale. The flare resulted from the interaction of a twisted filament and chromospheric fibrils. By inferring the reconnection to be fast and mediated by plasmoids, the relevance of this reconnection mode is found to extend beyond hot flare plasmas to such cool structures in the chromosphere, which have many analogs in astrophysical objects.

scholarly journals X-Ray and EUV Spectra of Solar Flares and Laboratory Plasmas

1975 ◽  
Vol 68 ◽  
pp. 165-181 ◽  
Author(s):  
G. A. Doschek
Keyword(s):  
Solar Flare ◽  
Solar Flares ◽  
Emission Lines ◽  
Laboratory Work ◽  
Iron Ions ◽  
X Ray ◽  
Laboratory Plasmas ◽  
Euv Spectrum ◽  
Recent Laboratory

Recent laboratory work relevant to solar flares on the spectroscopy of highly ionized atoms is reviewed. Much of this work has concerned the X-ray and EUV spectrum of iron ions, Fe XVIII–Fe XXIV, which produce prominent emission lines in the spectra of solar flares. Also discussed are recently obtained laboratory X-ray spectra of emission lines of hydrogen-like and helium-like ions, and associated satellite lines due to transitions of the type, 1s2l—2p2l, 1s22l—1s2p2l, and 1s22l— —1s2l3p. Satellite lines have also been identified in spectra of solar flares, and can be used to determine the electron temperature of the plasma. The laboratory work is important in the planning of future experiments in solar flare X-ray and EUV spectroscopy.

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