Buchlin, E., Aletti, V., Galtier, S., Velli, M. Einaudi, G., and Vial, J.-C., "A simplified numerical model of coronal energy dissipation based on reduced MHD," A&A 406, 1061-1070 (2003).
Click on the image above for a larger .gif version.
An illustration of how nanoflares might work in a model that tries to take SOC (self-organized criticality) to a more physical level via a calculation in the reduced MHD approximation. Note the lumps on the loop - "nanoflares" should have a spatial as well as a temporal intermittency. This seems to be a weak point of this kind of theory, because there are no observations of such lumps. That would be OK if the heating were non-local, but then what would be the merit of "reduced MHD"? You will have to give this paper a read to find out what if anything the authors have to say about this, but the Archivist has the opinion that full MHD is already too reduced for a theory of this phenomenon. It can't deal with non-local processes.
This cartoon follows along in the genre of the justly renowned Parker cartoon.
December 26, 2008
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