Quadratic helicities and the energy of magnetic fields
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🧮 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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