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Ultraviolet and extreme-ultraviolet emissions at the flare footpoints observed by atmosphere imaging assembly

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Sturrock_2013_TAJ_Ultra.pdf (1.078Mb)
Date
01/09/2013
Author
Qiu, J.
Sturrock, Z.
Longcope, D.W.
Klimchuk, J.A.
Liu, W.-J.
Keywords
Magnetic reconnection
Sun: flares
Sun: UV radiation
QB Astronomy
QC Physics
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Abstract
A solar flare is composed of impulsive energy release events by magnetic reconnection, which forms and heats flare loops. Recent studies have revealed a two-phase evolution pattern of UV 1600 Å emission at the feet of these loops: a rapid pulse lasting for a few seconds to a few minutes, followed by a gradual decay on timescales of a few tens of minutes. Multiple band EUV observations by the Atmosphere Imaging Assembly further reveal very similar signatures. These two phases represent different but related signatures of an impulsive energy release in the corona. The rapid pulse is an immediate response of the lower atmosphere to an intense thermal conduction flux resulting from the sudden heating of the corona to high temperatures (we rule out energetic particles due to a lack of significant hard X-ray emission). The gradual phase is associated with the cooling of hot plasma that has been evaporated into the corona. The observed footpoint emission is again powered by thermal conduction (and enthalpy), but now during a period when approximate steady-state conditions are established in the loop. UV and EUV light curves of individual pixels may therefore be separated into contributions from two distinct physical mechanisms to shed light on the nature of energy transport in a flare. We demonstrate this technique using coordinated, spatially resolved observations of UV and EUV emissions from the footpoints of a C3.2 thermal flare.
Citation
Qiu , J , Sturrock , Z , Longcope , D W , Klimchuk , J A & Liu , W-J 2013 , ' Ultraviolet and extreme-ultraviolet emissions at the flare footpoints observed by atmosphere imaging assembly ' , Astrophysical Journal , vol. 774 , no. 1 , 14 . https://doi.org/10.1088/0004-637X/774/1/14
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/774/1/14
ISSN
0004-637X
Type
Journal article
Rights
© 2013. The American Astronomical Society. All rights reserved.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5499

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