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Equilibrium and Stability of Collisionless Current Sheets

27 September 2013

Time: 4:30pm
Venue: Queens EB2
Series: 
Astronomy Unit Seminars
Speaker: 
Prof. Thomas Neukirch (U. St Andrews)
Host: 
David Burgess
 
Abstract: 

Many activity processes in space and astrophysical plasmas are closely connected to the existence or formation of current sheets - localized concentrations of the electric current density, which allow fundamental processes such as magnetic reconnection to take place.

To lowest order current sheets can be described as approximately one-dimensional structures and in many cases the spatial variation occurs on kinetic scales. In space plasma collisions can also often be neglected and thus the Vlasov-Maxwell equations have to be used to describe such current sheets.

In this talk I will give an overview of some  recent developments in the theory of collisionless current sheets, in particular the search for distribution functions for collisionless force-free current sheet equilibria. I will also show some preliminary results of first studies of their stability properties.

Linkshttp://www-solar.mcs.st-andrews.ac.uk/~thomas

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