Observations of Reconnection Flows in a Flare on the Solar Disk

Wang, Juntao, Simões, P. J.A., Jeffrey, Natasha, Fletcher, L., Wright, P. J. and Hannah, I. G. (2017) Observations of Reconnection Flows in a Flare on the Solar Disk. The Astrophysical Journal Letters, 847 (1). L1. ISSN 2041-8205

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Official URL: https://doi.org/10.3847/2041-8213/aa8904

Abstract

Magnetic reconnection is a well-accepted part of the theory of solar eruptive events, though the evidence is still circumstantial. Intrinsic to the reconnection picture of a solar eruptive event, particularly in the standard model for two-ribbon flares (CSHKP model), are an advective flow of magnetized plasma into the reconnection region, expansion of field above the reconnection region as a flux rope erupts, retraction of heated post-reconnection loops, and downflows of cooling plasma along those loops. We report on a unique set of Solar Dynamics Observatory/Atmospheric Imaging Assembly imaging and Hinode/EUV Imaging Spectrometer spectroscopic observations of the disk flare SOL2016-03-23T03:54 in which all four flows are present simultaneously. This includes spectroscopic evidence for a plasma upflow in association with large-scale expanding closed inflow field. The reconnection inflows are symmetric, and consistent with fast reconnection, and the post-reconnection loops show a clear cooling and deceleration as they retract. Observations of coronal reconnection flows are still rare, and most events are observed at the solar limb, obscured by complex foregrounds, making their relationship to the flare ribbons, cusp field, and arcades formed in the lower atmosphere difficult to interpret. The disk location and favorable perspective of this event have removed these ambiguities giving a clear picture of the reconnection dynamics.

Item Type: Article
Uncontrolled Keywords: solar wind, Sun: corona, Sun: coronal mass ejections (CMEs), Sun: filaments, prominences, Sun: flares, Sun: UV radiation
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 04 Sep 2019 15:22
Last Modified: 11 Oct 2019 12:50
URI: http://nrl.northumbria.ac.uk/id/eprint/40523

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