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Mathematics and Statistics

Photo of Prof Mitchell Berger

Prof Mitchell Berger



Mitchell Berger joined the University of Exeter in September 2007. Prior to his appointment at Exeter University he was a Harvard-Smithsonian Research Fellow, a PostDoc at the National Center for Atmospheric Research (Boulder Colorado), a PostDoc at the University of St Andrews and a Lecturer, Reader and Professor at University College London. Mitchell’s research interests include solar astrophysics, magnetohydrodynamics, and applications of topology and geometry. Mitchell is a Member of the IAU and the IMA.  In his spare time he enjoys playing the piano and cycling. 

Links with other universities

Harvard-Smithsonian, Durham, Helio Research (USA), UCLA


British Citizen


B.A. Princeton U. 1979

Ph.D. Harvard U. 1984

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No publications found

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Further information

Personal Homepage

A model for reconnecting magnetic flux elements. Braided magnetic fields can be a source of energy for solar coronal heating.

The geometrical measure of writhe can be helpful in interpreting images of solar magnetic loops. The writhe depends on both the shape of the projection (S shape or inverse S) as well as the height. These two loops both have negative writhe of - 0.2. The low lying inverse S loop can be a model for a solar sigmoid, while the taller S loop can model an erupting prominence.

Research Interests
  • Astrophysics, Solar Physics, Fluid Dynamics, Magnetohydrodynamics, Topology of Vector Fields, Knot Theory, Elasticity Theory, Ancient Astronomy

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