mission website. Among these publications, 3125 are refereed publications, 342 proceedings, 121 PhDs and 30 other types of theses. External links ESA Cluster mission website The Cluster Science Archive, the public data archive of the Cluster and the Double Star missions More on spacecraft operations ESA Cluster mission Twitter account Imperial College London role in the Cluster mission University College London's Mullard Space Science Laboratory's role in the Cluster mission Cluster: aurora explorer, an exhibit at the Royal Society Summer Exhibition 2011 The Cluster Active Archive (former public data archive, up to 2014) Cluster mission article on eoPortal by ESA European Space Agency space probes 2000 in spaceflight Geospace monitoring satellites Geomagnetic satellites