eprintid: 10186252
rev_number: 12
eprint_status: archive
userid: 699
dir: disk0/10/18/62/52
datestamp: 2024-01-30 11:54:53
lastmod: 2024-01-30 11:54:53
status_changed: 2024-01-30 11:54:53
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: McKevitt, James
creators_name: Jarolim, Robert
creators_name: Matthews, Sarah
creators_name: Baker, Deborah
creators_name: Temmer, Manuela
creators_name: Veronig, Astrid
creators_name: Reid, Hamish
creators_name: Green, Lucie
title: The Link between Nonthermal Velocity and Free Magnetic Energy in Solar Flares
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F63
note: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
abstract: The cause of excess spectral line broadening (nonthermal velocity) is not definitively known, but given its rise before and during flaring, the causal processes hold clues to understanding the triggers for the onset of reconnection and the release of free magnetic energy from the coronal magnetic field. A comparison of data during a 9 hr period from the extreme ultraviolet Imaging Spectrometer on the Hinode spacecraft—at a 3 minute cadence—and nonlinear force-free field extrapolations performed on Helioseismic and Magnetic Imager magnetograms—at a 12 minute cadence—shows an inverse relationship between nonthermal velocity and free magnetic energy on short timescales during two X-class solar flares on 2017 September 6. Analysis of these results supports suggestions that unresolved Doppler flows do not solely cause nonthermal broadening, and instead other mechanisms like Alfvén wave propagation and isotropic turbulence have a greater influence.
date: 2024-02-01
date_type: published
publisher: American Astronomical Society
official_url: https://doi.org/10.3847/2041-8213/ad1bee
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2142306
doi: 10.3847/2041-8213/ad1bee
lyricists_name: Matthews, Sarah
lyricists_name: Green, Lucinda
lyricists_name: McKevitt, James
lyricists_name: Baker, Deborah
lyricists_name: Reid, Hamish
lyricists_id: SAMAT57
lyricists_id: LGREE15
lyricists_id: JEMCK82
lyricists_id: DBAKE94
lyricists_id: HASRE98
actors_name: Kalinowski, Damian
actors_id: DKALI47
actors_role: owner
full_text_status: public
publication: The Astrophysical Journal Letters
volume: 961
number: 2
article_number: L29
issn: 2041-8205
citation:        McKevitt, James;    Jarolim, Robert;    Matthews, Sarah;    Baker, Deborah;    Temmer, Manuela;    Veronig, Astrid;    Reid, Hamish;           McKevitt, James;  Jarolim, Robert;  Matthews, Sarah;  Baker, Deborah;  Temmer, Manuela;  Veronig, Astrid;  Reid, Hamish;  Green, Lucie;   - view fewer <#>    (2024)    The Link between Nonthermal Velocity and Free Magnetic Energy in Solar Flares.                   The Astrophysical Journal Letters , 961  (2)    , Article L29.  10.3847/2041-8213/ad1bee <https://doi.org/10.3847/2041-8213%2Fad1bee>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10186252/2/McKevitt_2024_ApJL_961_L29.pdf