Some results of these tests, Dominic's 1962 Starfish Prime test in particular, presented concerns throughout the program's existence. In addition to the widespread effects of the nuclear explosion's electromagnetic pulse, which inadvertently damaged many satellites as well as land based electronics as far as 1500 km away, a large amount of charged particle radiation was released by the nuclear explosion. This radiation became trapped by the Earth's magnetic field, creating artificial belts of radiation 100 to 1,000 times stronger than background levels. The heightened levels of radiation eventually crippled one-third of all satellites in low orbit, while rendering seven others completely useless, including the first commercial communication satellite ever, Telstar.