*Jasmine Kaur Sandhu¹, I. J. Rae¹, M. Gkioulidou², C. Forsyth¹, G. D. Reeves³, M. P. Freeman⁴, K. R. Murphy⁵, M.-T. Walach⁶, H. E. Spence⁷ (1.Mullard Space Science Laboratory, University College London, UK., 2.Applied Physics Laboratory, John Hopkins University, USA., 3.Los Alamos National Laboratory, USA., 4.British Antarctic Survey, UK., 5.University of Maryland, USA., 6.Lancaster University, UK., 7.University of New Hampshire, USA.)