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

20 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

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