Centre for the Analysis of Time Series, London School of Economics and Political Science, London, United Kingdom; Physics, University of Warwick, Coventry, United Kingdom
Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry, United Kingdom
Akhiezer Institute of Theoretical Physics,, Kharkiv, Ukraine
University College London, London, United Kingdom
Queen Mary University of London, London, United Kingdom
GRI and CATS, London School of Economics, London, United Kingdom