[link to en.wikipedia.org]

operation starfish prime.
On 9 July 1962, at 09:00:09 Coordinated Universal Time, (which was 8 July, Honolulu time, at nine seconds after 11 p.m.), the Starfish Prime test was successfully detonated at an altitude of 400 kilometres (250 mi)

Starfish Prime was a high-altitude nuclear test conducted by the United States of America on July 9, 1962, a joint effort of the Atomic Energy Commission (AEC) and the Defense Atomic Support Agency (which became the Defense Nuclear Agency in 1971).

Launched via a Thor rocket and carrying a W49 thermonuclear warhead (manufactured by Los Alamos Scientific Laboratory) and a Mk. 4 reentry vehicle, the explosion took place 250 miles (400 kilometers) above a point 19 miles (31 kilometers) southwest of Johnston Island in the Pacific Ocean. It was one of five tests conducted by the USA in outer space as defined by the FAI. It produced a yield equivalent to 1.4 megatons of TNT.

After effects

While some of the energetic beta particles followed the Earth's magnetic field and illuminated the sky, other high-energy electrons became trapped and formed radiation belts around the earth. There was much uncertainty and debate about the composition, magnitude and potential adverse effects from this trapped radiation after the detonation. The weaponeers became quite worried when three satellites in low earth orbit were disabled. These man-made radiation belts eventually crippled one-third of all satellites in low earth orbit. Seven satellites failed over the months following the test as radiation damaged their solar arrays or electronics, including the first commercial relay communication satellite, Telstar.[9][10] Detectors on Telstar, TRAAC, Injun, and Ariel 1 were used to measure distribution of the radiation produced by the tests.[11]

In 1963, Brown et al. reported in the Journal of Geophysical Research that Starfish Prime had created a belt of MeV electrons,[12] and Wilmot Hess reported in 1968 that some Starfish electrons remained for five years.[citation needed] Others reported that radioactive particles from Starfish Prime descended to earth seasonally and accumulated in terrestrial organisms such as fungi and lichens.[citation needed]


i also read, that this nuketest in space, made the
radiation in VAN Allen much worse.
and it is also the cause of the atlantic annomalie!