Fast plasmoid-mediated reconnection in a solar flare

• DOI: 10.1038/s41467-022-28269-w
• Publication Date: 2022-02-02T11:06:03Z
• Authors: Xiaoli Yan; Zhike Xue; Chaowei Jiang; E. R. Priest; Bernhard Kliem; Liheng Yang; Jincheng Wang; Defang Kong; Yongliang Song; Xueshang Feng; Zhong Liu
• Keywords: ddc:500; Science; ddc:530; Q; 0103 physical sciences; Institut für Physik und Astronomie; 7. Clean energy; 01 natural sciences; Article

AbstractMagnetic reconnection is a multi-faceted process of energy conversion in astrophysical, space and laboratory plasmas that operates at microscopic scales but has macroscopic drivers and consequences. Solar flares present a key laboratory for its study, leaving imprints of the microscopic physics in radiation spectra and allowing the macroscopic evolution to be imaged, yet a full observational characterization remains elusive. Here we combine high resolution imaging and spectral observations of a confined solar flare at multiple wavelengths with data-constrained magnetohydrodynamic modeling to study the dynamics of the flare plasma from the current sheet to the plasmoid scale. The analysis suggests that the flare resulted from the interaction of a twisted magnetic flux rope surrounding a filament with nearby magnetic loops whose feet are anchored in chromospheric fibrils. Bright cusp-shaped structures represent the region around a reconnecting separator or quasi-separator (hyperbolic flux tube). The fast reconnection, which is relevant for other astrophysical environments, revealed plasmoids in the current sheet and separatrices and associated unresolved turbulent motions.