Contribution of ULF Wave Activity to the Global Recovery of the Outer Radiation Belt During the Passage of a High-Speed Solar Wind Stream Observed in September 2014

L. A. Da Silva; D. Sibeck; L. R. Alves; V. M. Souza; P. R. Jauer; S. G. Claudepierre; J. P. Marchezi; O Agapitov; C. Medeiros; L. E. A. Vieira; C. Wang; S. Jiankui; Z. Liu; W. Gonzalez; A. Dal Lago; M. Rockenbach; M. B. Padua; M. Alves; D. Baker; M-C Fok; M. V. G. Barbosa; C. Kletzing; S. G. Kanekal; M. Georgiou

doi:10.1029/2018JA026184

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Contribution of ULF Wave Activity to the Global Recovery of the Outer Radiation Belt During the Passage of a High-Speed Solar Wind Stream Observed in September 2014

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Contribution of ULF Wave Activity to the Global Recovery of the Outer Radiation Belt During the Passage of a High-Speed Solar Wind Stream Observed in September 2014

L. A. Da Silva, D. Sibeck, L. R. Alves, V. M. Souza, P. R. Jauer, S. G. Claudepierre, J. P. Marchezi, O Agapitov, C. Medeiros, L. E. A. Vieira, …

Journal of geophysical research. Space physics, Vol.124(3), pp.1660-1678

03/2019

DOI: 10.1029/2018JA026184

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Abstract

Energy coupling between the solar wind and the Earth's magnetosphere can affect the electron population in the outer radiation belt. However, the precise role of different internal and external mechanisms that leads to changes of the relativistic electron population is not entirely known. This paper describes how ultralow frequency (ULF) wave activity during the passage of Alfvenic solar wind streams contributes to the global recovery of the relativistic electron population in the outer radiation belt. To investigate the contribution of the ULF waves, we searched the Van Allen Probes data for a period in which we can clearly distinguish the enhancement of electron fluxes from the background. We found that the global recovery that started on 22 September 2014, which coincides with the corotating interaction region preceding a high-speed stream and the occurrence of persistent substorm activity, provides an excellent scenario to explore the contribution of ULF waves. To support our analyses, we employed ground- and space-based observational data and global magnetohydrodynamic simulations and calculated the ULF wave radial diffusion coefficients employing an empirical model. Observations show a gradual increase of electron fluxes in the outer radiation belt and a concomitant enhancement of ULF activity that spreads from higher to lower L-shells. Magnetohydrodynamic simulation results agree with observed ULF wave activity in the magnetotail, which leads to both fast and Alfven modes in the magnetospheric nightside sector. The observations agree with the empirical model and are confirmed by phase space density calculations for this global recovery period.

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Title: Subtitle: Contribution of ULF Wave Activity to the Global Recovery of the Outer Radiation Belt During the Passage of a High-Speed Solar Wind Stream Observed in September 2014
Creators: L. A. Da Silva - Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
D. Sibeck - Goddard Space Flight Center
L. R. Alves - National Institute for Space Research
V. M. Souza - National Institute for Space Research
P. R. Jauer - National Institute for Space Research
S. G. Claudepierre - The Aerospace Corporation
J. P. Marchezi - National Institute for Space Research
O Agapitov - Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
C. Medeiros - National Institute for Space Research
L. E. A. Vieira - National Institute for Space Research
C. Wang - National Space Science Center
S. Jiankui - Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
Z. Liu - National Space Science Center
W. Gonzalez - National Institute for Space Research
A. Dal Lago - National Institute for Space Research
M. Rockenbach - National Institute for Space Research
M. B. Padua - National Institute for Space Research
M. Alves - National Institute for Space Research
D. Baker - Laboratory for Atmospheric and Space Physics
M. V. G. Barbosa - National Institute for Space Research
M-C Fok - Goddard Space Flight Center
C. Kletzing - University of Iowa
S. G. Kanekal - Goddard Space Flight Center
M. Georgiou - University College London
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.124(3), pp.1660-1678
Publisher: Amer Geophysical Union
DOI: 10.1029/2018JA026184
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 19
Grant note: 307404/2016-1; 310900/2016-6 / CNPq/MCTIC 41674145 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC) NE/P017185/1 / Natural Environment Research Council (NERC); UK Research & Innovation (UKRI) CNPq/MCTIC: 118586/2017-3 / Brazilian National Council for Scientific and Technological Development; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) Van Allen Probes mission China-Brazil Joint Laboratory for Space Weather
Language: English
Date published: 03/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984428805502771

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