Accretion Disk Dynamos, Transient Dynamos, and Magnetically Dominated Dynamos: Concepts and Open Questions
by
Eric Blackman(Rochester)
→
Europe/Stockholm
Nordita Seminar Room
Nordita Seminar Room
Description
In this three part talk I will: (1) Consider some recent puzzles that
analyses of
MRI numerical simulation have revealed and how they may have
unexpectedly revealed the importance
of large scale magnetic fields for accretion disks; (2) Discuss the
importance of dynamos in planetary
nebulae engines and how they motivate further study of "transient
dynamos" not usually the focus
of traditional dynamo applications; (3) Emphasize the importance of
magnetically dominated
dynamos in astrophysics: While most astrophysical dynamo research
focuses on flow dominated field amplification most observations
measure the field in magentically dominated coronae. Magnetic
helicity evolution is a unifying link between flow dominated dynamos,
coronal field amplification, and laboratory plasma dynamos. More
work on the magnetically dominated regime of coronal field evolution
via magnetic helicity evolution is warranted.
This is a lecture in connection with the Nordita program on Turbulence and Dynamos.
