Energy of Force-free Magnetic Fields in Relation to Coronal Mass Ejections
Choe, G. S. and C. Z. Cheng, Energy of Force-free Magnetic Fields in Relation to Coronal Mass Ejections, ApJ, 574, L179-L182 (2002) (ADS)
(click on the image for a larger version)
Not so much a cartoon as a stage in a model calculation that purports
to overcome the Aly-Sturrock constraint on CME occurrence. Recall
that the Aly-Sturrock conjecture maintains that the open state of
a magnetic field with a specified convex boundary contains the
largest energy of any possible field configuration matching the
same condition.
Thus an opening of the field - the manifest
appearance of a CME - could not happen as the result of an instability
on energetics grounds.
This has led minority elements among theorists to seek refuge in
non-magnetic forces or else in external drivers.
This paper claims that it is all OK and one can readily build up a "super-Aly" field
energy, all of it closed, with no problem.
As of the time of writing this comment, there
had only been 8 ADS citations of this paper, and only up to 19 by
the update date!
That is odd considering its fundamentally important
claim, and just goes to show that we scientists are not engaged in anything
well-organized here as regards progres...
In any case it is a nice rendering, an early striking use of color in these
cartoons.
This cartoon also might also be useful in illustrating root-canal trauma in a
green bicuspid tooth.
Not so much a cartoon as a stage in a model calculation that purports to overcome the Aly-Sturrock constraint on CME occurrence. Recall that the Aly-Sturrock conjecture maintains that the open state of a magnetic field with a specified convex boundary contains the largest energy of any possible field configuration matching the same condition. Thus an opening of the field - the manifest appearance of a CME - could not happen as the result of an instability on energetics grounds. This has led minority elements among theorists to seek refuge in non-magnetic forces or else in external drivers. This paper claims that it is all OK and one can readily build up a "super-Aly" field energy, all of it closed, with no problem. As of the time of writing this comment, there had only been 8 ADS citations of this paper, and only up to 19 by the update date! That is odd considering its fundamentally important claim, and just goes to show that we scientists are not engaged in anything well-organized here as regards progres...
In any case it is a nice rendering, an early striking use of color in these cartoons. This cartoon also might also be useful in illustrating root-canal trauma in a green bicuspid tooth.