TY - JOUR AV - public UR - https://doi.org/10.3847/2041-8213/ad1bee A1 - McKevitt, James A1 - Jarolim, Robert A1 - Matthews, Sarah A1 - Baker, Deborah A1 - Temmer, Manuela A1 - Veronig, Astrid A1 - Reid, Hamish A1 - Green, Lucie SN - 2041-8205 N2 - 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. VL - 961 JF - The Astrophysical Journal Letters PB - American Astronomical Society ID - discovery10186252 N1 - 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. Y1 - 2024/02/01/ IS - 2 TI - The Link between Nonthermal Velocity and Free Magnetic Energy in Solar Flares ER -