Alfvén Waves in Solar Flares
arXiv:2311.02144 · doi:10.1002/9781394195985.ch3
Abstract
Solar flares are dramatic events in which magnetic reconnection in the corona leads to heating of plasma to tens of MK and acceleration of particles to high energies. They also centrally involve transport between the corona (where the magnetic reconnection occurs) and the lower solar atmosphere (where most energy is radiated from). There is substantial evidence for the presence of Alfvénic waves/turbulence in solar flares, for example, in the ubiquitous nonthermal broadening of flare spectral lines. The physical role that Alfvénic waves have in the flare has attracted considerable attention, especially since 2007-2010. This article reviews what spectroscopic observations reveal about the properties and importance of Alfvénic waves, turbulence and transport in solar flares; mechanisms for wave excitation by magnetic reconnection at high Lundquist numbers and braking of the sunward reconnection jet; and models of wave energy transport to the lower atmosphere and the resulting heating and dynamics. The article finishes with discussion of the outlook for new progress.
arXiv commentAccepted for publication in "Alfvén Waves Across Heliophysics: Progress, Challenges, and Opportunities" (American Geophysical Union). Further reproduction or electronic distribution is not permitted
References in corpus (94)
- The Interface Region Imaging Spectrograph (IRIS)
- Reconnection in a Weakly Stochastic Field
- An Observational Overview of Solar Flares
- Instability of current sheets and formation of plasmoid chains
- Fast Reconnection in High-Lundquist-Number Plasmas Due to Secondary Tearing Instabilities
- MHD Turbulence Revisited
- Plasmoid-Induced-Reconnection and Fractal Reconnection
- Fast magnetic reconnection in the plasmoid-dominated regime
- Impulsive phase flare energy transport by large-scale Alfven waves and the electron acceleration problem
- Numerical Tests of Fast Reconnection in Weakly Stochastic Magnetic Fields
- Scaling laws of resistive magnetohydrodynamic reconnection in the high-Lundquist-number, plasmoid-unstable regime
- Velocity Characteristics of Evaporated Plasma Using Hinode/EIS
- Magnetic reconnection and stochastic plasmoid chains in high-Lundquist-number plasmas
- Observing the fine structure of loops through high resolution spectroscopic observations of coronal rain with the CRISP instrument at the Swedish Solar Telescope
- Recent Advances in Understanding Particle Acceleration Processes in Solar Flares
- On the nature of kink MHD waves in magnetic flux tubes
- Stochastic Acceleration by Turbulence
- Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
- Self-Feeding Turbulent Magnetic Reconnection on Macroscopic Scales
- Electric current in flares ribbons: observations and 3D standard model
- Nonlinear Instability of kink oscillations due to shear motions
- From coronal observations to MHD simulations, the building blocks for 3D models of solar flares
- Measurement of magnetic field and relativistic electrons along a solar flare current sheet
- Double Coronal Hard and Soft X-ray Source Observed by RHESSI: Evidence for Magnetic Reconnection and Particle Acceleration in Solar Flares
- Spectroscopic Observations of Current Sheet Formation and Evolution
- Global Forces in Eruptive Solar Flares: The Lorentz force Acting on the Solar Atmosphere and the Solar Interior
- Observations of Turbulent Magnetic Reconnection Within a Solar Current Sheet
- Temporal evolution of multiple evaporating ribbon sources in a solar flare
- Looptop Hard X-Ray Emission in Solar Flares: Images and Statistics
- The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection
- Turbulent Magnetohydrodynamic Reconnection Mediated by the Plasmoid Instability
- Temporal evolution of chromospheric evaporation: case studies of the M1.1 flare on 2014 September 6 and X1.6 flare on 2014 September 10
- Observational Evidence of Back-reaction on the Solar Surface Associated with Coronal Magnetic Restructuring in Solar Eruptions
- Role of magnetic reconnection in MHD turbulence
- High Spatial Resolution Observations of Loops in the Solar Corona
- Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST)
- Turbulent kinetic energy in the energy balance of a solar flare
- Turbulent Magnetic Reconnection in Two Dimensions
- Local re-acceleration and a modified thick target model of solar flare electrons
- The height of a white-light flare and its hard X-ray sources
- Plasmoid and Kelvin-Helmholtz instabilities in Sweet-Parker current sheets
- A Statistical Model of Magnetic Islands in a Large Current Layer
- Properties of a solar flare kernel observed by Hinode and SDO
- Heating and Acceleration of the Fast Solar Wind by Alfvén Wave Turbulence
- Simulations of the Mg II k and Ca II 8542 lines from an Alfvén Wave-heated flare chromosphere
- The 2014 March 29 X-flare: sub-arcsecond resolution observations of Fe XXI 1354.1
- The Multi-slit Approach to Coronal Spectroscopy with the Multi-slit Solar Explorer (MUSE)
- On the Distribution of Plasmoids In High-Lundquist-Number Magnetic Reconnection
- Abrupt longitudinal magnetic field changes in flaring active regions
- Understanding the Physical Nature of Coronal "EIT Waves"
- Plasmoid Instability in High-Lundquist-Number Magnetic Reconnection
- Formation of Power-law Electron Energy Spectra in Three-dimensional Low- Magnetic Reconnection
- Statistics of Reconnection-Driven Turbulence
- Propagation of Alfvénic Waves From Corona to Chromosphere and Consequences for Solar Flares
- Comparison of secondary islands in collisional reconnection to Hall reconnection
- Simultaneous IRIS and Hinode/EIS observations and modelling of the 27 October 2014 X 2.0 class flare
- Spatially-Resolved Nonthermal Line Broadening During The Impulsive Phase of a Solar Flare
- The Origin of Underdense Plasma Downflows Associated with Magnetic Reconnection in Solar Flares
- Alfvénic Wave Heating of the Upper Chromosphere in Flares
- The Width Distribution of Loops and Strands in the Solar Corona -- Are we Hitting Rock Bottom ?
- The High-Resolution Coronal Imager, Flight 2.1
- Chromospheric Evaporation in an X1.0 Flare on 2014 March 29 Observed with IRIS and EIS
- A spatio-temporal description of the abrupt changes in the photospheric magnetic and Lorentz-force vectors during the 2011 February 15 X2.2 flare
- Spectroscopic Observations of a Current Sheet in a Solar Flare
- Broad Non-Gaussian Fe XXIV Line Profiles in the Impulsive Phase of the 2017 September 10 X8.3 class Flare Observed by Hinode/EIS
- Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE): II. Flares and Eruptions
- Self-generated turbulence in magnetic reconnection
- The development of lower-atmosphere turbulence early in a solar flare
- Parallel electric field generation by Alfven wave turbulence
- Structure and Evolution of Magnetic Fields Associated with Solar Eruptions (Invited Review)
- Three-dimensional Spontaneous Magnetic Reconnection
- Is the High-Resolution Coronal Imager Resolving Coronal Strands? Results from AR 12712
- Non-Maxwellian analysis of the transition-region line profiles observed by the Interface Region Imaging Spectrograph
- Flare Ribbon Energetics in the Early Phase of an SDO Flare
- A fully self-consistent model for solar flares
- First evidence of non-Gaussian solar flare EUV spectral line profiles and accelerated non-thermal ion motion
- A stringent limit on the amplitude of Alfvénic perturbations in high-beta low-collisionality plasmas
- A Hydrodynamic Model of Alfvénic Wave Heating in a Coronal Loop and its Chromospheric Footpoints
- Kelvin-Helmholtz versus Tearing Instability: What Drives Turbulence in Stochastic Reconnection?
- MHD turbulence formation in solar flares: 3D simulation and synthetic observations
- IRIS, Hinode, SDO, and RHESSI observations of a white light flare produced directly by non-thermal electrons
- Onset of turbulent fast magnetic reconnection observed in the solar atmosphere
- Spectropolarimetric Insight into Plasma-Sheet Dynamics of a Solar Flare
- Fast Magnetic Reconnection with Turbulence in High Lundquist Number Limit
- MHD simulations of three-dimensional Resistive Reconnection in a cylindrical plasma column
- Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection
- The Spatial and Temporal Variations of Turbulence in a Solar Flare
- Impulsive Heating of Solar Flare Ribbons Above 10 MK
- Plasma heating in a post eruption Current Sheet: a case study based on ultraviolet, soft, and hard X-ray data
- Evolution, structure and topology of self-generated turbulent reconnection layers
- Sunquake Generation by Coronal Magnetic Restructuring
- Forward modelling of particle acceleration and transport in an individual solar flare
- Abrupt Longitudinal Magnetic Field Changes and Ultraviolet Emissions Accompanying Solar Flares
- Impact of 3D Structure on Magnetic Reconnection