Joseph, as I've written they are working on this looking fundamentally coronal heating problem for decades, mass transfer is definitely not enough and fusion is practically negligible ... so it seems there are two main approaches now: by magneto-acoustic waves and by magnetic reconnections ...
There is extremely interesting yesterday's NASA announcement:
http://www.nasa.gov/mission_pages/voyag ... prise.html
Voyager has found bubble-like foam of magnetic field lines (flux ropes/vortex lines?) coming from our Sun:
"(...)
"The sun's magnetic field extends all the way to the edge of the solar system," explains Opher. "Because the sun spins, its magnetic field becomes twisted and wrinkled, a bit like a ballerina's skirt. Far, far away from the sun, where the Voyagers are now, the folds of the skirt bunch up."
When a magnetic field gets severely folded like this, interesting things can happen. Lines of magnetic force criss-cross, and "reconnect". (Magnetic reconnection is the same energetic process underlying solar flares.) The crowded folds of the skirt reorganize themselves, sometimes explosively, into foamy magnetic bubbles.
(...)"
ps. Here is recent PRL article about laboratory experiments of magnetic flux ropes:
http://prl.aps.org/abstract/PRL/v105/i7/e075005