Abstract
Earth's auroral electrons radiate some of their energy in radio waves. Theories of the mechanism for emission of this radiation, known as auroral kilometric radiation (AKR), suggest that this radiation propagates away from Earth and cannot be detected at ground level. However, LaBelle and Anderson present the first evidence that AKR does penetrate to ground level. On three occasions in July 2004 the researchers detected radio emissions that appeared to be AKR at the South Pole Station in Antarctica. They compared these emissions with AKR emissions detected simultaneously by the U.S.‐Japanese Geotail satellite and found that they had the same frequency structure, suggesting that the emissions detected at ground level were indeed AKR. (Geophysical Research Letters, doi:10.1029/2010GL046411, 2011)
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