The unexpected origin of plasmaspheric hiss from discrete chorus emissions

Jacob Bortnik (), Richard M. Thorne and Nigel P. Meredith
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Jacob Bortnik: University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA
Richard M. Thorne: University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA
Nigel P. Meredith: British Antarctic Survey, Natural Environment Research Council, Madingley Road, Cambridge, CB3 0ET, UK

Nature, 2008, vol. 452, issue 7183, 62-66

Abstract: Plasmaspheric chorus line Plasmaspheric hiss is a type of electromagnetic wave found in the dense plasma region — the plasmasphere — that encircles the Earth. This hiss is a dominant factor in controlling the two-zone structure of the Van Allen radiation belts, and since it removes high-energy electrons from the plasmasphere, it plays a pivotal role in reducing the radiation hazards to satellites and humans in space. Many theories have been proposed to explain the origin of the hiss, but none have stood the test of time. Bortnik et al. have used data from the CRRES satellite to develop a new model that explains hiss as a derivative of another wave type called chorus. Previously thought to be unrelated to hiss, chorus can propagate into the plasmasphere and subsequently evolve into hiss.

Date: 2008
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DOI: 10.1038/nature06741

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