Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field

Stribling, Troy; Matthaeus, William H.; Oughton, Sean

Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field

dc.contributor.author	Stribling, Troy
dc.contributor.author	Matthaeus, William H.
dc.contributor.author	Oughton, Sean
dc.date.accessioned	2014-04-03T22:31:11Z
dc.date.available	2014-04-03T22:31:11Z
dc.date.copyright	1995
dc.date.issued	1995
dc.description.abstract	A computational investigation of magnetic helicity of the fluctuatingmagnetic fieldHm in ideal and freely decaying three‐dimensional (3‐D) magnetohydrodynamics (MHD) in the presence of a uniform mean magnetic field is performed. It is shown that for ideal 3‐D MHDHm, which is a rugged invariant in the absence of a mean magnetic field [Frisch et al., J. Fluid Mech. 77, 796 (1975)], decays from its initial value and proceeds to oscillate about zero. The decay of Hm is shown to result from the presence of a new ‘‘generalized’’ helicity invariant, which includes contributions from the uniform magnetic field. The loss of invariance of Hm will diminish the effects of inverse transfer of Hm on freely decaying turbulence. This is demonstrated in a discussion of the selective decay relaxation process.	en_NZ
dc.format.mimetype	application/pdf
dc.identifier.citation	Stribling, T., Matthaeus, W. H., & Oughton, S. (1995). Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field. Physics of Plasmas, 2(5), 1437.	en_NZ
dc.identifier.doi	10.1063/1.871359	en_NZ
dc.identifier.uri	https://hdl.handle.net/10289/8617
dc.language.iso	en	en_NZ
dc.publisher	American Institute of Physics	en_NZ
dc.relation.ispartof	Physics of Plasmas
dc.rights	© 1995 American Institute of Physics	en_NZ
dc.title	Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field	en_NZ
dc.type	Journal Article	en_NZ