Predicting the radiation risk to ESA’s astronauts   ESA astronaut Christer Fuglesang during the second spacewalk of the STS-116 mission to the International Space Station. Fuglesang stands on a platform at the end of the Station's robotic arm, Canadarm2, during operations to relocate two CETA carts.   ESA astronaut Christer Fuglesang during the second spacewalk of Space Shuttle mission STS-116. Fuglesang stands on a platform on the end of the Station's robotic arm, Canadarm2, during operations to move two CETA carts on the truss - the Station's girder-like backbone structure.   A significant geomagnetic storm impacted the Earth beginning early Thursday afternoon around 1:00 p.m. Eastern time, 14 December 2006, according to forecasters at the NOAA Space Environment Center in Boulder, Colo. Impacts from events like this can cause problems with High Frequency communications, satellite operations and induce currents in power grids. Release date: 19 May 2008