Impulse Formulations of Hall Magnetohydrodynamic Equations
نویسنده
چکیده
Impulse formulations of Hall magnetohydrodynamic (MHD) equations are developed. The Lagrange invariance of a generalized magnetic helicity is established for Hall MHD. The physical implications of this Lagrange invariant are discussed. The discussion is then extended to compressible Hall MHD. Compressibility effects are show not to affect, as to be expected, the physical implications of the generalized magnetic helicity invariant. ∗Permanent Address: University of Central Florida, Orlando, FL 32816-1364
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