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Fluctuation dynamo at finite correlation times using renewing flows
Pallavi Bhat, Kandaswamy Subramanian
Fluctuation dynamos are generic to turbulent astrophysical systems. The only analytical model of the fluctuation dynamo, due to Kazantsev, assumes the velocity to be delta-correlat…
Saturation of Zeldovich Stretch-Twist-Fold Map Dynamos
Amit Seta, Pallavi Bhat, Kandaswamy Subramanian
Zeldovich's stretch-twist fold (STF) dynamo provided a breakthrough in conceptual understanding of fast dynamos, including fluctuation or small scale dynamos. We study the evolutio…
Traces of large-scale dynamo action in the kinematic stage
Kandaswamy Subramanian, Axel Brandenburg
Using direct numerical simulations (DNS) we verify that in the kinematic regime, a turbulent helical dynamo grows in such a way that the magnetic energy spectrum remains to high pr…
Magnetic Spiral Arms and Galactic Outflows
Luke Chamandy, Anvar Shukurov, Kandaswamy Subramanian
Galactic magnetic arms have been observed between the gaseous arms of some spiral galaxies; their origin remains unclear. We suggest that magnetic spiral arms can be naturally gene…
Non-linear galactic dynamos: A toolbox
Luke Chamandy, Anvar Shukurov, Kandaswamy Subramanian +1
We compare various models and approximations for non-linear mean-field dynamos in disc galaxies to assess their applicability and accuracy, and thus to suggest a set of simple solu…