@inbook{eed37aaffee846b3a5fb6dc5dd02ac2a,
title = "Helicity-conserving relaxation in unstable and merging twisted magnetic flux ropes",
abstract = "Twisted magnetic flux ropes are reservoirs of free magnetic energy. In a highly conducting plasma such as the solar corona, energy release through multiple magnetic reconnections can be modeled as a helicity-conserving relaxation to a minimum energy state. One possible trigger for this relaxation is the ideal kink instability in a twisted flux rope. We show that this provides a good description for confined solar flares and we develop the approach from idealized cylindrical models to realistic models of coronal loops. Using 3D magnetohydrodynamic simulations combined with test-particle simulations of nonthermal electrons and ions, we predict multiple observational signatures of such flares. We then show how interactions and mergers of flux ropes can release free magnetic energy, using relaxation theory to complement simulations of merging-compression formation in spherical tokamaks and heating avalanches in the solar corona.",
keywords = "Flux ropes, Helicity, Relaxation, Solar flares",
author = "Browning, {Philippa K.} and Mykola Gordovskyy and Hood, {Alan W.}",
year = "2023",
month = dec,
day = "15",
doi = "10.1002/9781119841715.ch13",
language = "English",
isbn = "9781119841685",
series = "Geophysical monograph series",
publisher = "Wiley",
number = "283",
pages = "189--202",
editor = "Kirill Kuzanyan and Nobumitsu Yokoi and Georgoulis, {Manolis K.} and Rodion Stepanov",
booktitle = "Helicities in geophysics, astrophysics, and beyond",
}