Alfvén waves in solar flares

Alexander J. B. Russell*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

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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.
Original languageEnglish
Title of host publicationAlfvén waves across heliophysics
Subtitle of host publicationprogress, challenges, and opportunities
EditorsAndreas Keiling
PublisherAmerican Geophysical Union (AGU)
Chapter3
Volume285
ISBN (Electronic)9781394195985
ISBN (Print)9781394195954
DOIs
Publication statusPublished - 12 Apr 2024
EventAGU Chapman Conference on Advances in Understanding Alfvén Waves in the Sun and the Heliosphere - Berlin, Germany
Duration: 28 May 20232 Jun 2023
https://www.agu.org/Chapman-Alfven-Waves

Publication series

NameGeophysical Monograph Series
PublisherWiley
Volume285

Conference

ConferenceAGU Chapman Conference on Advances in Understanding Alfvén Waves in the Sun and the Heliosphere
Country/TerritoryGermany
CityBerlin
Period28/05/232/06/23
Internet address

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