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Active region formation through the negative effective magnetic pressure instability View all abstracts by submitter

Axel Brandenburg   Submitted: 2013-09-14 23:55

The negative effective magnetic pressure instability operates on scales encompassing many turbulent eddies and is here discussed in connection with the formation of active regions near the surface layers of the Sun. This instability is related to the negative contribution of turbulence to the mean magnetic pressure that causes the formation of large-scale magnetic structures. For an isothermal layer, direct numerical simulations and mean-field simulations of this phenomenon are shown to agree in many details in that their onset occurs at the same depth. This depth increases with increasing field strength, such that the maximum growth rate of this instability is independent of the field strength, provided the magnetic structures are fully contained within the domain. A linear stability analysis is shown to support this finding. The instability also leads to a redistribution of turbulent intensity and gas pressure that could provide direct observational signatures.

Authors: Koen Kemel, Axel Brandenburg, Nathan Kleeorin, Dhrubaditya Mitra, Igor Rogachevskii
Projects: None

Publication Status: Solar Phys. 287, 293-313 (2013)
Last Modified: 2013-09-16 11:32
Go to main E-Print page  Kinetic Alfv?n Turbulence and Parallel Electric Fields in Flare Loops  Microwave and EUV Observations of an Erupting Filament and Associated Flare and CME  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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