Heating of coronal plasma by anomalous current dissipation.
Rosner, R., L. Golub, B. Coppi, and G. S. Vaiana, Heating of coronal plasma by anomalous current dissipation., ApJ, 222, 317-332 (1978) (ADS)
(click on the image for a larger version)
Here the idea would be that the stresses imposed by photospheric motions
would only create twist in the outer layer of a flux tube.
At this point in time (and later) people were looking for photospheric
drivers for flare effects, both in terms of
magnetic fields
as well as
currents.
Of course both pictures have to agree and be correct.
The Archivist asks the usual question here: what is there about the
convection zone that matches the fluid shear at the two footpoints?
Without a match, an EMF should result from a charge separation.
Also, in panel (b), the same consideration: is there a current source
just at the transition region?
Here the idea would be that the stresses imposed by photospheric motions would only create twist in the outer layer of a flux tube. At this point in time (and later) people were looking for photospheric drivers for flare effects, both in terms of magnetic fields as well as currents. Of course both pictures have to agree and be correct. The Archivist asks the usual question here: what is there about the convection zone that matches the fluid shear at the two footpoints? Without a match, an EMF should result from a charge separation. Also, in panel (b), the same consideration: is there a current source just at the transition region?