Curtis J. Saxton (1), Kinwah Wu (1,2), Joao. B. G. Canalle (3), Mark
  Cropper (1) and Gavin Ramsay (1,4) ((1) Mullard Space Science Lab, University
  College London, (2) Department of Physics, National Tsing Hua University, (3)
  State University of Rio de Janeiro, (4) Armagh Observatory)