Radial transport of radiation belt electrons in kinetic field-line resonances

C. C. Chaston; J. W. Bonnell; J. R. Wygant; G. D. Reeves; D. N. Baker; D. B. Melrose; Iver H. Cairns

doi:10.1002/2017GL074587

Radial transport of radiation belt electrons in kinetic field-line resonances

C. C. Chaston, J. W. Bonnell, J. R. Wygant, G. D. Reeves, D. N. Baker, D. B. Melrose, Iver H. Cairns

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

A representative case study from the Van Allen Probes during a geomagnetic storm recovery phase reveals enhanced electron fluxes at intermediate pitch angles over energies from ~100 keV to 5 MeV coincident with broadband low-frequency electromagnetic waves. The statistical properties of these waves are used to build a model for radial diffusion via drift-bounce resonances in kinetic Alfvén eigenmodes/kinetic field-line resonances. Estimated diffusion coefficients indicate timescales for radial transport on the order of hours in storm time events at energies from <100 keV to MeVs over equatorial pitch angles from the edge of the loss cone to nearly perpendicular to the geomagnetic field. The correlation of kinetic resonances with electron depletions and enhancements during storm main phase and recovery, and the rapid diffusion these waves drive, suggests that they may modulate the outer radiation belt.

Original language	English (US)
Pages (from-to)	8140-8148
Number of pages	9
Journal	Geophysical Research Letters
Volume	44
Issue number	16
DOIs	https://doi.org/10.1002/2017GL074587
State	Published - Aug 28 2017

Bibliographical note

Funding Information:
This research was supported by NASA grants NNX15AF57G and NNX16AG69G and Van Allen Probes (RBSP) funding provided under NASA prime contract NAS5-01072, including the EFW investi gation (PI: J.R. Wygant, University of Minnesota) and RBSP-ECT JHU/APL under contract 967399. Data generated from theoretical models are stored on Linux workstations at the Space Sciences Laboratory at UC Berkeley and can be accessed by contacting the first author. Van Allen Probes measurements used in this study can be obtained from the following data repositories: EFW http://www.space.umn.edu/rbspefw- data/, HOPE/MAGEIS/REPT https://www. rbsp-ect.lanl.gov/science/ DataDirectories.php, and/or by directly contacting the first author.

Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.

Keywords

Alfvén waves
diffusion
field-line resonances
radiation belts
transport

Publisher link

10.1002/2017GL074587

Find It

Find It at U of M Libraries

Cite this

@article{679d8876cc274566b1c9023d50f065c6,

title = "Radial transport of radiation belt electrons in kinetic field-line resonances",

abstract = "A representative case study from the Van Allen Probes during a geomagnetic storm recovery phase reveals enhanced electron fluxes at intermediate pitch angles over energies from ~100 keV to 5 MeV coincident with broadband low-frequency electromagnetic waves. The statistical properties of these waves are used to build a model for radial diffusion via drift-bounce resonances in kinetic Alfv{\'e}n eigenmodes/kinetic field-line resonances. Estimated diffusion coefficients indicate timescales for radial transport on the order of hours in storm time events at energies from <100 keV to MeVs over equatorial pitch angles from the edge of the loss cone to nearly perpendicular to the geomagnetic field. The correlation of kinetic resonances with electron depletions and enhancements during storm main phase and recovery, and the rapid diffusion these waves drive, suggests that they may modulate the outer radiation belt.",

keywords = "Alfv{\'e}n waves, diffusion, field-line resonances, radiation belts, transport",

author = "Chaston, {C. C.} and Bonnell, {J. W.} and Wygant, {J. R.} and Reeves, {G. D.} and Baker, {D. N.} and Melrose, {D. B.} and Cairns, {Iver H.}",

note = "Funding Information: This research was supported by NASA grants NNX15AF57G and NNX16AG69G and Van Allen Probes (RBSP) funding provided under NASA prime contract NAS5-01072, including the EFW investi gation (PI: J.R. Wygant, University of Minnesota) and RBSP-ECT JHU/APL under contract 967399. Data generated from theoretical models are stored on Linux workstations at the Space Sciences Laboratory at UC Berkeley and can be accessed by contacting the first author. Van Allen Probes measurements used in this study can be obtained from the following data repositories: EFW http://www.space.umn.edu/rbspefw- data/, HOPE/MAGEIS/REPT https://www. rbsp-ect.lanl.gov/science/ DataDirectories.php, and/or by directly contacting the first author. Publisher Copyright: {\textcopyright}2017. American Geophysical Union. All Rights Reserved.",

year = "2017",

month = aug,

day = "28",

doi = "10.1002/2017GL074587",

language = "English (US)",

volume = "44",

pages = "8140--8148",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "American Geophysical Union",

number = "16",

}

TY - JOUR

T1 - Radial transport of radiation belt electrons in kinetic field-line resonances

AU - Chaston, C. C.

AU - Bonnell, J. W.

AU - Wygant, J. R.

AU - Reeves, G. D.

AU - Baker, D. N.

AU - Melrose, D. B.

AU - Cairns, Iver H.

N1 - Funding Information: This research was supported by NASA grants NNX15AF57G and NNX16AG69G and Van Allen Probes (RBSP) funding provided under NASA prime contract NAS5-01072, including the EFW investi gation (PI: J.R. Wygant, University of Minnesota) and RBSP-ECT JHU/APL under contract 967399. Data generated from theoretical models are stored on Linux workstations at the Space Sciences Laboratory at UC Berkeley and can be accessed by contacting the first author. Van Allen Probes measurements used in this study can be obtained from the following data repositories: EFW http://www.space.umn.edu/rbspefw- data/, HOPE/MAGEIS/REPT https://www. rbsp-ect.lanl.gov/science/ DataDirectories.php, and/or by directly contacting the first author. Publisher Copyright: ©2017. American Geophysical Union. All Rights Reserved.

PY - 2017/8/28

Y1 - 2017/8/28

N2 - A representative case study from the Van Allen Probes during a geomagnetic storm recovery phase reveals enhanced electron fluxes at intermediate pitch angles over energies from ~100 keV to 5 MeV coincident with broadband low-frequency electromagnetic waves. The statistical properties of these waves are used to build a model for radial diffusion via drift-bounce resonances in kinetic Alfvén eigenmodes/kinetic field-line resonances. Estimated diffusion coefficients indicate timescales for radial transport on the order of hours in storm time events at energies from <100 keV to MeVs over equatorial pitch angles from the edge of the loss cone to nearly perpendicular to the geomagnetic field. The correlation of kinetic resonances with electron depletions and enhancements during storm main phase and recovery, and the rapid diffusion these waves drive, suggests that they may modulate the outer radiation belt.

AB - A representative case study from the Van Allen Probes during a geomagnetic storm recovery phase reveals enhanced electron fluxes at intermediate pitch angles over energies from ~100 keV to 5 MeV coincident with broadband low-frequency electromagnetic waves. The statistical properties of these waves are used to build a model for radial diffusion via drift-bounce resonances in kinetic Alfvén eigenmodes/kinetic field-line resonances. Estimated diffusion coefficients indicate timescales for radial transport on the order of hours in storm time events at energies from <100 keV to MeVs over equatorial pitch angles from the edge of the loss cone to nearly perpendicular to the geomagnetic field. The correlation of kinetic resonances with electron depletions and enhancements during storm main phase and recovery, and the rapid diffusion these waves drive, suggests that they may modulate the outer radiation belt.

KW - Alfvén waves

KW - diffusion

KW - field-line resonances

KW - radiation belts

KW - transport

UR - http://www.scopus.com/inward/record.url?scp=85027962162&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027962162&partnerID=8YFLogxK

U2 - 10.1002/2017GL074587

DO - 10.1002/2017GL074587

M3 - Article

AN - SCOPUS:85027962162

SN - 0094-8276

VL - 44

SP - 8140

EP - 8148

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 16

ER -

Radial transport of radiation belt electrons in kinetic field-line resonances

Abstract

Bibliographical note

Keywords

Publisher link

Find It

Other files and links

Fingerprint

Cite this