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

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

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...453..335k&link_type=abstract

Astronomy and Astrophysics, Volume 453, Issue 1, July I 2006, pp.335-339

Astronomy and Astrophysics

Astrophysics

5

Sun: Corona, Sun: Flares, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays, Magnetohydrodynamics (Mhd)

Scientific paper

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.

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