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Explaining the dynamics of the ultra-relativistic third Van Allen radiation belt

Mann, IR; Ozeke, LG; Murphy, KR; Claudepierre, SG; Turner, DL; Baker, DN; Rae, IJ; ... Honary, F; + view all (2016) Explaining the dynamics of the ultra-relativistic third Van Allen radiation belt. Nature Physics , 12 pp. 978-983. 10.1038/nphys3799. Green open access

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Abstract

Since the discovery of the Van Allen radiation belts over 50 years ago, an explanation for their complete dynamics has remained elusive. Especially challenging is understanding the recently discovered ultra-relativistic third electron radiation belt. Current theory asserts that loss in the heart of the outer belt, essential to the formation of the third belt, must be controlled by high-frequency plasma wave-particle scattering into the atmosphere, via whistler mode chorus, plasmaspheric hiss, or electromagnetic ion cyclotron waves. However, this has failed to accurately reproduce the third belt. Using a data-driven, time-dependent specification of ultra-low-frequency (ULF) waves we show for the first time how the third radiation belt is established as a simple, elegant consequence of storm-time extremely fast outward ULF wave transport. High-frequency wave-particle scattering loss into the atmosphere is not needed in this case. When rapid ULF wave transport coupled to a dynamic boundary is accurately specified, the sensitive dynamics controlling the enigmatic ultra-relativistic third radiation belt are naturally explained.

Type: Article
Title: Explaining the dynamics of the ultra-relativistic third Van Allen radiation belt
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/nphys3799
Publisher version: http://dx.doi.org/10.1038/nphys3799
Language: English
Additional information: Copyright © 2016 Macmillan Publishers Limited. All rights reserved
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1503374
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