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Observation of Loop Connectivity Change in a Solar Flare Triggered by Loop-Loop Interaction View all abstracts by submitter

Linhui Sui   Submitted: 2005-09-30 08:37

Magnetic reconnection between two adjacent magnetic loops or arcades has been a longstanding model for solar flares. However, the observations supporting this quadrupolar flare model are mainly post-reconnection observations. We present a set of flare observations in EUV, X-rays and H which shows that a pre-flare loop changed its connectivity soon after the start of an M1 flare on June 2, 2002. A large arcade of loops seen in EUV expanded slowly at ~6 km s-1 about 3 min before the start of the flare. Another smaller EUV loop expanded rapidly at ~100 km s-1 at the start of the flare. After ~20 s, the smaller loop then reconnected with magnetic loops within the arcade, resulting in two new post-reconnection loops. The newly-formed, smaller EUV loop, with a long cusp at the looptop, was also observed in X-rays. The newly-formed, larger loop, visible in EUV and H, with a twisted structure and a jagged looptop, expanded outwards at ~490 km s-1. The 6-12 keV image during the first of two hard X-ray peaks showed the two footpoints of the newly-formed, smaller loop and a separate coronal source which was located much higher than the looptop seen later in the same energy band. We speculate that the coronal X-ray source was at or near the initial reconnecting point of the two interacting loops. All these observations indicate: (1) the loop-loop interaction was the trigger of the flare; (2) new loop systems do result from the magnetic reconnection of interacting loops; and (3) the cusp-shaped loops often seen in soft X-rays and EUV can be the product of the interaction of two loops.

Authors: Sui, L., Holman, G. D., Dennis, B. R.

Publication Status: submitted to ApJ
Last Modified: 2005-09-30 08:37
Go to main E-Print page  Multi-Wavelength Study of the 3B/X1.2 Flare Observed on 2003 October 26  Multiwavelength Analysis of a Solar Flare on 2002 April 15  Edit Entry  Download Preprint  Delete Entry 

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