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

Josef I. Khan   Submitted: 2006-06-30 10:22

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 Yohkoh Soft X-ray Telescope (SXT). The retracting loop is observed to shrink with a speed of 118 ± 66 km s-1. 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-1. We interpret the shrinking loop and simultaneous outward moving loop as direct evidence for reconnected magnetic field lines during a flare.

Authors: Khan, J. I., Fletcher, L., & Nitta, N. V.
Projects: Yohkoh-HXT,Yohkoh-SXT

Publication Status: A&A, 2006, Vol. 453, pp. 335-339
Last Modified: 2006-07-20 08:24
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Observations of simultaneous coronal loop shrinkage and expansion during the decay phase of a solar flare

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