Observations of simultaneous coronal loop shrinkage and expansion during the decay phase of a solar flare

Khan, J.I., Fletcher, L. and Nitta, N.V. (2006) Observations of simultaneous coronal loop shrinkage and expansion during the decay phase of a solar flare. Astronomy and Astrophysics, 453(1), pp. 335-339. (doi:10.1051/0004-6361:20054604)

Khan, J.I., Fletcher, L. and Nitta, N.V. (2006) Observations of simultaneous coronal loop shrinkage and expansion during the decay phase of a solar flare. Astronomy and Astrophysics, 453(1), pp. 335-339. (doi:10.1051/0004-6361:20054604)

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Publisher's URL: http://dx.doi.org/10.1051/0004-6361:20054604

Abstract

We report what we believe are the first direct and unambiguous observations of simultaneous coronal magnetic flux loop shrinkage and expansion during the decay phase of a solar flare. The retracting and expanding loops were observed nearly face-on (i.e., with the loop major axis approximately orthogonal to the line of sight) in emission in imaging data from the <i>Yohkoh</i> Soft X-ray Telescope (SXT). The retracting loop is observed to shrink with a speed of 118 ± 66 km s<sup>-1</sup>. The faint outward moving loop-like feature occurred ~200´´ above the shrinking loop during the time of the shrinking loop. We estimate the speed of the outward moving loop was ~129 ± 74 km s<sup>-1</sup>. We interpret the shrinking loop and simultaneous outward moving loop as direct evidence for reconnected magnetic field lines during a flare.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Khan, Dr Josef and Fletcher, Professor Lyndsay
Authors: Khan, J.I., Fletcher, L., and Nitta, N.V.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astronomy and Astrophysics
Publisher:EDP Sciences
ISSN:0004-6361
ISSN (Online):1432-0746
Copyright Holders:Copyright © 2006 EDP Sciences
First Published:First published in Astronomy and Astrophysics 453(1):335-339
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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