Physics – Plasma Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dppqm1001b&link_type=abstract
American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C
Physics
Plasma Physics
Scientific paper
Understanding the in situ amplification or sustenance of magnetic fields in astrophysical rotators has been a long standing subject of research. Using the Galaxy and sun as frameworks for discussion, I will distinguish between the MHD origin problems of large scale magnetic flux and small scale magnetic energy in a turbulent rotator. I will point out some puzzles with both types of amplification. I will then discuss mean field dynamo amplification of large scale flux, the criticisms this theory has faced, and how real systems may circumvent these criticisms. Magnetic helicity plays an important role in the field amplification process and it turns out that its conservation may have to be violated by finite boundary terms for the dynamo to work. The sun seems to show evidence for the importance of these terms. A new generation of simulations with open boundaries seems to be necessary to fully test whether astrophysical mean field dynamo action proceeds "fast" or "slow."
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