Tsuneta, S., and T. Naito, "Fermi acceleration at the fast shock in a solar flare and the impulsive loop-top hard X-ray source," ApJ 495, L67-L79, 1998.

Click on the image above for a larger version of the .gif file.

This cartoon follows the standard development based on the 2D reconnection model (see any of many examples here in the Archive), but makes specific and interesting suggestions about particle acceleration. These ideas somewhat follow the observations in the magnetosphere, wherein the auroral particle acceleration happens on closed field lines. Here the reconnection exhaust flows excites waves in closed coronal loops, resulting in (perhaps) a coronal hard X-ray source, but also (as commonly observed) the footpoint hard X-ray sources. Doing the acceleration with the Fermi mechanism, as proposed here, might have a luminosity problem.

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