What phenomenon was observed in 2012 by the Van Allen Probes?
Answer
A transient third radiation belt
In 2012, researchers analyzing data from the Van Allen Probes discovered a third, narrower radiation belt. This structure was transient, existing for approximately four weeks during a period of intense solar activity before being cleared away by a solar shockwave. This discovery proved that the traditional two-belt model is not the only possible configuration for the magnetosphere.
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Discovery - Earth Has 3rd Radiation Belt | Video - YouTube
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