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Effects of ULF wave power on relativistic radiation belt electrons: 8-9 October 2012 geomagnetic storm

Pokhotelov, D; Rae, IJ; Murphy, KR; Mann, IR; Ozeke, L; (2016) Effects of ULF wave power on relativistic radiation belt electrons: 8-9 October 2012 geomagnetic storm. Journal of Geophysical Research: Space Physics , 121 (12) pp. 11766-11779. 10.1002/2016JA023130. Green open access

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Abstract

Electromagnetic ultralow-frequency (ULF) waves are known to play a substantial role in radial transport, acceleration, and loss of relativistic particles trapped in the Earth's outer radiation belt. Using in situ observations by multiple spacecraft operating in the vicinity of outer radiation belts, we analyze the temporal and spatial behavior of ULF waves throughout the geomagnetic storm of 8–9 October 2012 and compare with the dynamics of relativistic electron fluxes on board the twin Van Allen Probes spacecraft. The analysis shows that the relativistic electron fluxes reduce from their prestorm levels during the first phase of the storm and rapidly increase during the second phase of the storm. We demonstrate that the behavior of ULF wave power changes throughout the storm, from ULF oscillations being a mixture of compressional and shear magnetic components during the first phase of the storm to ULF oscillations being dominated by transverse (shear) components during the second phase. We analyze the parameters of ULF-driven radial diffusion throughout the storm and compare the observed diffusion coefficients with their statistical averages. We demonstrate that the observed diffusion coefficients are strong enough to impact the redistribution of relativistic electron fluxes from and to the outer boundary of radiation belts and the diffusion might influence the effects of any local electron acceleration by transporting fluxes inward or outward according to phase space density gradients.

Type: Article
Title: Effects of ULF wave power on relativistic radiation belt electrons: 8-9 October 2012 geomagnetic storm
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2016JA023130
Publisher version: http://dx.doi.org/10.1002/2016JA023130
Language: English
Additional information: ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, LOCAL ACCELERATION, LOSSES, DIFFUSION, THEMIS
UCL classification: UCL
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/1546188
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