Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0476m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0476
Other
7544 Stellar Interiors And Dynamo Theory, 7863 Turbulence
Scientific paper
Dynamo effect allows the creation of large scale magnetic fields through a purely mechanic driving. This effect has long been postulated to saturate when the self-generated large scale magnetic field grows above a certain threshold. On the other hand, some numerical results show an apparent suppression of the dynamo effect [1] in the presence of a strong, large scale, externally supported magnetic field. Here we show that the overall behavior in these extreme cases, as well as in intermediate cases, can be understood in terms of: (i) conservation of a generalized form of magnetic helicity; and (ii) a proper separation of scales. These results lend additional perspective to the sometimes difficult issue of the relationship between the physics of externally supported- and locally supported mean magnetic fields. Research supported in part by NSF grants ATM-0105254 and ATM-9977692. [1] D. C. Montgomery, W. H. Matthaeus, L. J. Milano and P. Dmitruk, Phys. Plasmas, 9 1221 (2002)
Dmitruk Pablo
Matthaeus William H.
Milano Leonardo J.
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