On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12-A Case Study

Claudia Medeiros; V. M. Souza; L. E. A. Vieira; D. G. Sibeck; A. J. Halford; S. -B. Kang; L. A. Da Silva; L. R. Alves; J. P. Marchezi; R. S. Dallaqua; P. R. Jauer; M. Rockenbach; O. Mendes; M. V. Alves; A. Dal Lago; M. -C. Fok; S. G. Kanekal; D. N. Baker; C. A. Kletzing

doi:10.3847/1538-4357/aaf970

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On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12-A Case Study

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On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12-A Case Study

Claudia Medeiros, V. M. Souza, L. E. A. Vieira, D. G. Sibeck, A. J. Halford, S. -B. Kang, L. A. Da Silva, L. R. Alves, J. P. Marchezi, R. S. Dallaqua, …

The Astrophysical journal, Vol.872(1), p.36

02/10/2019

DOI: 10.3847/1538-4357/aaf970

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Abstract

Following the arrival of two interplanetary coronal mass ejections on 2014 September 12, the Relativistic Electron-Proton Telescope instrument on board the twin Van Allen Probes observed a long-term dropout in the outer belt electron fluxes. The interplanetary shocks compressed the magnetopause, thereby enabling the loss of relativistic electrons in the outer radiation belt to the magnetosheath region via the magnetopause shadowing. Previous studies have invoked enhanced radial transport associated with ultra-low-frequency waves activity and/or scattering into the atmosphere by whistler mode chorus waves to explain electron losses deep within the magnetosphere (L. <. 5.5). We show that energetic electron pitch angle distributions (PADs) provide strong evidence for precipitation also via interaction with electromagnetic ion cyclotron (EMIC) waves. High-resolution magnetic field observations on Van Allen Probe B confirm the sporadic presence of EMIC waves during the most intense dropout phase on September 12. Observational results suggest that magnetopause shadowing and EMIC waves together were responsible for reconfiguring the relativistic electron PADs into peculiar butterfly PAD shapes a few hours after an interplanetary shock arrived at Earth.

Physical Sciences

Astronomy & Astrophysics

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Title: Subtitle: On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12-A Case Study
Creators: Claudia Medeiros - Instituto Nacional de Pesquisas Espaciais
V. M. Souza - Instituto Nacional de Pesquisas Espaciais
L. E. A. Vieira - Instituto Nacional de Pesquisas Espaciais
D. G. Sibeck - Goddard Space Flight Center
A. J. Halford - The Aerospace Corporation
S. -B. Kang - NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
L. A. Da Silva - Instituto Nacional de Pesquisas Espaciais
L. R. Alves - Instituto Nacional de Pesquisas Espaciais
J. P. Marchezi - Instituto Nacional de Pesquisas Espaciais
R. S. Dallaqua - Instituto Nacional de Pesquisas Espaciais
P. R. Jauer - Instituto Nacional de Pesquisas Espaciais
M. Rockenbach - Instituto Nacional de Pesquisas Espaciais
O. Mendes - Instituto Nacional de Pesquisas Espaciais
M. V. Alves - Instituto Nacional de Pesquisas Espaciais
A. Dal Lago - Instituto Nacional de Pesquisas Espaciais
M. -C. Fok - Goddard Space Flight Center
S. G. Kanekal - Goddard Space Flight Center
D. N. Baker - University of Colorado Boulder
C. A. Kletzing - University of Iowa
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.872(1), p.36
DOI: 10.3847/1538-4357/aaf970
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Iop Publishing Ltd
Number of pages: 17
Grant note: NAS5-01072 / Energetic Particle, Composition, and Thermal Plasma (RBSP-ECT) under NASA's Prime 304209/2014-7 / Brazilian National Council for Research and Development (CNPq) via the PCI; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) 2014/21229-9 / Sao Paulo Research Foundation (FAPESP); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Language: English
Date published: 02/10/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984428791302771

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