Geodesic
Quadratic helicities and the energy of magnetic fields
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations and dynamical systems, Tome 278 (2012), pp. 16-28.

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Two new nonlocal asymptotic invariants of magnetic fields frozen into a finite domain filled with an ideal liquid conducting medium are introduced. The velocity of variation of the invariants in a nonideal medium is estimated for magnetic fields described by the induction equation. The invariants are used to study the spectral characteristics of magnetic fields. 
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P. M. Akhmet'ev. Quadratic helicities and the energy of magnetic fields. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations and dynamical systems, Tome 278 (2012), pp. 16-28. http://geodesic.mathdoc.fr/item/TM_2012_278_a1/

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