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arxiv: 1110.0997 · v1 · pith:QDRNGDVBnew · submitted 2011-10-05 · 🧮 math-ph · math.GT· math.MP

Quadratic helicities and the energy of magnetic fields

classification 🧮 math-ph math.GTmath.MP
keywords magneticfieldsinvariantshelicitiesmagnetohydrodynamicsasymptoticdiscusseddissipation
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Two non-local asymptotic invariants of magnetic fields for the ideal magnetohydrodynamics are introduced. The velocity of variation of the invariants for a non-ideal magnetohydrodynamics with a small magnetic dissipation is estimated. By means of the invariants the spectra of electromagnetic fields are investigated. A possible role of higher magnetic helicities during a relaxation of magnetic fields is discussed.

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