Dispersive Alfvén Wave Control of O+ Ion Outflow and Energy Densities in the Inner Magnetosphere

A. J. Hull; C. C. Chaston; J. W. Bonnell; J. R. Wygant; C. A. Kletzing; G. D. Reeves; A. Gerrard

doi:10.1029/2019GL083808

Dispersive Alfvén Wave Control of O⁺ Ion Outflow and Energy Densities in the Inner Magnetosphere

A. J. Hull
, C. C. Chaston
, J. W. Bonnell
, J. R. Wygant
, C. A. Kletzing
, G. D. Reeves
, A. Gerrard

Physics and Astronomy (Twin Cities)

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

37 Scopus citations

Abstract

The relationship between dispersive Alfvén waves (DAWs), magnetospheric activity, and O⁺ ion outflow/energy density is examined using measurements from the Van Allen Probes. We show that correlated DAW activity and O⁺ outflow/energization is a characteristic feature of the inner magnetosphere during active conditions and during storms persists for several hours over large L-shell and azimuthal ranges of the plasma sheet. Though enhanced during substorm and storm active periods, these correlated features are most intense during geomagnetic storms. Comparisons show a linear relationship between DAW electric (and magnetic) field energy density and outflowing O⁺ energy. Statistical measurements from a large number of storms also reveal a linear relationship between DAW energy density and gross enhancements in energetic O⁺ energy densities. These observations support the notion that DAWs play an important role in the energization of O⁺ ions into and within the inner magnetosphere.

Original language	English (US)
Pages (from-to)	8597-8606
Number of pages	10
Journal	Geophysical Research Letters
Volume	46
Issue number	15
DOIs	https://doi.org/10.1029/2019GL083808
State	Published - Aug 16 2019

Bibliographical note

Funding Information:
This research was supported by NASA grant NNX17AG69G and Van Allen Probes funding provided under NASA prime contract NAS5-01072, including the EFW investigation (PI: J.R. Wygant, University of Minnesota), the EMFISIS investigation (PI: C.A. Kletzing, University of Iowa) under JHU/APL contract 921647, RBSP-ECT JHU/APL under contract 967399, and RBSP-RBSPICE JHU/APL under contract 937836 to the New Jersey Institute of Technology. Data used are publicly available online (https://rbsp-ect.lanl.gov/data_pub/), https://emfisis.physics.uiowa.edu/, http://www.space.umn.edu/rbspefw-data/, and http://rbspice.ftecs.com/.

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Keywords

dispersive Alfven waves
geomagnetic storms
inner magnetosphere
ion outflow
oxygen ions
substorms

Publisher link

10.1029/2019GL083808

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@article{56eb033b43784840a807f15271931a04,

title = "Dispersive Alfv{\'e}n Wave Control of O+ Ion Outflow and Energy Densities in the Inner Magnetosphere",

abstract = "The relationship between dispersive Alfv{\'e}n waves (DAWs), magnetospheric activity, and O+ ion outflow/energy density is examined using measurements from the Van Allen Probes. We show that correlated DAW activity and O+ outflow/energization is a characteristic feature of the inner magnetosphere during active conditions and during storms persists for several hours over large L-shell and azimuthal ranges of the plasma sheet. Though enhanced during substorm and storm active periods, these correlated features are most intense during geomagnetic storms. Comparisons show a linear relationship between DAW electric (and magnetic) field energy density and outflowing O+ energy. Statistical measurements from a large number of storms also reveal a linear relationship between DAW energy density and gross enhancements in energetic O+ energy densities. These observations support the notion that DAWs play an important role in the energization of O+ ions into and within the inner magnetosphere.",

keywords = "dispersive Alfven waves, geomagnetic storms, inner magnetosphere, ion outflow, oxygen ions, substorms",

author = "Hull, \{A. J.\} and Chaston, \{C. C.\} and Bonnell, \{J. W.\} and Wygant, \{J. R.\} and Kletzing, \{C. A.\} and Reeves, \{G. D.\} and A. Gerrard",

note = "Funding Information: This research was supported by NASA grant NNX17AG69G and Van Allen Probes funding provided under NASA prime contract NAS5-01072, including the EFW investigation (PI: J.R. Wygant, University of Minnesota), the EMFISIS investigation (PI: C.A. Kletzing, University of Iowa) under JHU/APL contract 921647, RBSP-ECT JHU/APL under contract 967399, and RBSP-RBSPICE JHU/APL under contract 937836 to the New Jersey Institute of Technology. Data used are publicly available online (https://rbsp-ect.lanl.gov/data\_pub/), https://emfisis.physics.uiowa.edu/, http://www.space.umn.edu/rbspefw-data/, and http://rbspice.ftecs.com/. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",

year = "2019",

month = aug,

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doi = "10.1029/2019GL083808",

language = "English (US)",

volume = "46",

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T1 - Dispersive Alfvén Wave Control of O+ Ion Outflow and Energy Densities in the Inner Magnetosphere

AU - Hull, A. J.

AU - Chaston, C. C.

AU - Bonnell, J. W.

AU - Wygant, J. R.

AU - Kletzing, C. A.

AU - Reeves, G. D.

AU - Gerrard, A.

N1 - Funding Information: This research was supported by NASA grant NNX17AG69G and Van Allen Probes funding provided under NASA prime contract NAS5-01072, including the EFW investigation (PI: J.R. Wygant, University of Minnesota), the EMFISIS investigation (PI: C.A. Kletzing, University of Iowa) under JHU/APL contract 921647, RBSP-ECT JHU/APL under contract 967399, and RBSP-RBSPICE JHU/APL under contract 937836 to the New Jersey Institute of Technology. Data used are publicly available online (https://rbsp-ect.lanl.gov/data_pub/), https://emfisis.physics.uiowa.edu/, http://www.space.umn.edu/rbspefw-data/, and http://rbspice.ftecs.com/. Publisher Copyright: ©2019. American Geophysical Union. All Rights Reserved.

PY - 2019/8/16

Y1 - 2019/8/16

N2 - The relationship between dispersive Alfvén waves (DAWs), magnetospheric activity, and O+ ion outflow/energy density is examined using measurements from the Van Allen Probes. We show that correlated DAW activity and O+ outflow/energization is a characteristic feature of the inner magnetosphere during active conditions and during storms persists for several hours over large L-shell and azimuthal ranges of the plasma sheet. Though enhanced during substorm and storm active periods, these correlated features are most intense during geomagnetic storms. Comparisons show a linear relationship between DAW electric (and magnetic) field energy density and outflowing O+ energy. Statistical measurements from a large number of storms also reveal a linear relationship between DAW energy density and gross enhancements in energetic O+ energy densities. These observations support the notion that DAWs play an important role in the energization of O+ ions into and within the inner magnetosphere.

AB - The relationship between dispersive Alfvén waves (DAWs), magnetospheric activity, and O+ ion outflow/energy density is examined using measurements from the Van Allen Probes. We show that correlated DAW activity and O+ outflow/energization is a characteristic feature of the inner magnetosphere during active conditions and during storms persists for several hours over large L-shell and azimuthal ranges of the plasma sheet. Though enhanced during substorm and storm active periods, these correlated features are most intense during geomagnetic storms. Comparisons show a linear relationship between DAW electric (and magnetic) field energy density and outflowing O+ energy. Statistical measurements from a large number of storms also reveal a linear relationship between DAW energy density and gross enhancements in energetic O+ energy densities. These observations support the notion that DAWs play an important role in the energization of O+ ions into and within the inner magnetosphere.

KW - dispersive Alfven waves

KW - geomagnetic storms

KW - inner magnetosphere

KW - ion outflow

KW - oxygen ions

KW - substorms

UR - https://www.scopus.com/pages/publications/85070980350

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U2 - 10.1029/2019GL083808

DO - 10.1029/2019GL083808

M3 - Article

AN - SCOPUS:85070980350

SN - 0094-8276

VL - 46

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EP - 8606

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 15

ER -