Space plasmas, magnetospheric and auroral physics. Particular interests in:

1. the acceleration of auroral particles by quasi-static and wave electric fields; 
2. the dynamics, energy transport and fast magnetic flux transport within the magnetotail;
   
3. the energy coupling between the magnetosphere and ionosphere;
4. the interpretation and limitations of multi-spacecraft and single-spacecraft analysis techniques.

 I primarily study these phenomena using data from ESA's Cluster spacecraft, supplemented by data from ground-based observatories and other magnetospheric observatories.