Ole Baltazar Andersen, Technical University of Denmark, Kgs. Lyngby, Denmark, Karina Nielsen, DTU-SPACE, Kgs. Lyngby, Denmark, Simon David Paul Williams, National Oceanography Centre, Liverpool, United Kingdom, Shfaqat Abbas Khan, Technical University of Denmark - Space, Kongens Lyngby, Denmark and Michael Kern, European Space Agency, ESTEC, Netherlands