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

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..369..485k&link_type=abstract

New Solar Physics with Solar-B Mission ASP Conference Series, Vol. 369, proceedings of the conference held 8-11 November, 2005 a

Physics

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 165±26 km s^{-1}. The faint outward moving loop-like feature occurred ˜200 arcsec above the shrinking loop during the time of the shrinking loop. We estimate the speed of the outward moving loop was ˜280±130 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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