Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study

Jie Ren; Q. G. Zong; X. Z. Zhou; H. E. Spence; H. O. Funsten; J. R. Wygant; R. Rankin

doi:10.1029/2019JA027009

Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study

Jie Ren, Q. G. Zong, X. Z. Zhou, H. E. Spence, H. O. Funsten, J. R. Wygant, R. Rankin

Physics and Astronomy (Twin Cities)

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18 Scopus citations

Abstract

Six years of Van Allen Probes data are used to investigate cold plasmaspheric electrons affected by ultralow-frequency (ULF) waves in the inner magnetosphere (L<7) including spatial distributions, occurrence conditions, and resonant energy range. Events exhibit a global distribution within L= 4–7 but preferentially occur at L∼5.5–7 in the dayside, while there is higher occurrence rate in the duskside than dawnside. They can occur under different geomagnetic activities and solar wind velocities (V_S), but the occurrence rates are increasing with larger AE, |SYMH|, and V_S. These features are closely associated with the generation and propagation of ULF waves in Pc4 (45–150 s) and Pc5 (150–600 s) bands. Combined with electron observations from HOPE instrument, the resonant energies inferred from wave power indicate that cold electrons at ones to hundreds of electron volts can be affected by ULF waves. This study may shed new light on further investigations on the acceleration and transportation of cold plasmaspheric particles that would affect plasmaspheric material release to the Earth's magnetosphere and instabilities for exciting various waves.

Original language	English (US)
Pages (from-to)	7954-7965
Number of pages	12
Journal	Journal of Geophysical Research: Space Physics
Volume	124
Issue number	10
DOIs	https://doi.org/10.1029/2019JA027009
State	Published - Oct 1 2019

Bibliographical note

Funding Information:
This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5‐01072, including HOPE data from the RBSP/ECT website ( https://www.rbsp-ect.lanl.gov/science/DataDirectories.php ), magnetic field data from the RBSP/EMFISIS website ( http://emfisis.physics.uiowa.edu/data/index ), and electric field data from the RBSP/EFW website ( http://www.space.umn.edu/rbspefw-data/ . The OMNI data are available at CDAWeb ( http://omniweb.gsfc.nasa.gov ).

Funding Information:
This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5-01072, including HOPE data from the RBSP/ECT website (https://www.rbsp-ect.lanl.gov/science/DataDirectories.php), magnetic field data from the RBSP/EMFISIS website (http://emfisis.physics.uiowa.edu/data/index), and electric field data from the RBSP/EFW website (http://www.space.umn.edu/rbspefw-data/. The OMNI data are available at CDAWeb (http://omniweb.gsfc.nasa.gov).

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

Keywords

ULF waves
cold plasmaspheric electrons
drift-bounce resonance
wave-particle interaction

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10.1029/2019JA027009

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title = "Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study",

abstract = "Six years of Van Allen Probes data are used to investigate cold plasmaspheric electrons affected by ultralow-frequency (ULF) waves in the inner magnetosphere (L<7) including spatial distributions, occurrence conditions, and resonant energy range. Events exhibit a global distribution within L= 4–7 but preferentially occur at L∼5.5–7 in the dayside, while there is higher occurrence rate in the duskside than dawnside. They can occur under different geomagnetic activities and solar wind velocities (VS), but the occurrence rates are increasing with larger AE, |SYMH|, and VS. These features are closely associated with the generation and propagation of ULF waves in Pc4 (45–150 s) and Pc5 (150–600 s) bands. Combined with electron observations from HOPE instrument, the resonant energies inferred from wave power indicate that cold electrons at ones to hundreds of electron volts can be affected by ULF waves. This study may shed new light on further investigations on the acceleration and transportation of cold plasmaspheric particles that would affect plasmaspheric material release to the Earth's magnetosphere and instabilities for exciting various waves.",

keywords = "ULF waves, cold plasmaspheric electrons, drift-bounce resonance, wave-particle interaction",

author = "Jie Ren and Zong, {Q. G.} and Zhou, {X. Z.} and Spence, {H. E.} and Funsten, {H. O.} and Wygant, {J. R.} and R. Rankin",

note = "Funding Information: This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5‐01072, including HOPE data from the RBSP/ECT website ( https://www.rbsp-ect.lanl.gov/science/DataDirectories.php ), magnetic field data from the RBSP/EMFISIS website ( http://emfisis.physics.uiowa.edu/data/index ), and electric field data from the RBSP/EFW website ( http://www.space.umn.edu/rbspefw-data/ . The OMNI data are available at CDAWeb ( http://omniweb.gsfc.nasa.gov ). Funding Information: This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5-01072, including HOPE data from the RBSP/ECT website (https://www.rbsp-ect.lanl.gov/science/DataDirectories.php), magnetic field data from the RBSP/EMFISIS website (http://emfisis.physics.uiowa.edu/data/index), and electric field data from the RBSP/EFW website (http://www.space.umn.edu/rbspefw-data/. The OMNI data are available at CDAWeb (http://omniweb.gsfc.nasa.gov). Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",

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AU - Ren, Jie

AU - Zong, Q. G.

AU - Zhou, X. Z.

AU - Spence, H. E.

AU - Funsten, H. O.

AU - Wygant, J. R.

AU - Rankin, R.

N1 - Funding Information: This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5‐01072, including HOPE data from the RBSP/ECT website ( https://www.rbsp-ect.lanl.gov/science/DataDirectories.php ), magnetic field data from the RBSP/EMFISIS website ( http://emfisis.physics.uiowa.edu/data/index ), and electric field data from the RBSP/EFW website ( http://www.space.umn.edu/rbspefw-data/ . The OMNI data are available at CDAWeb ( http://omniweb.gsfc.nasa.gov ). Funding Information: This work was supported by the National Postdoctoral Program for Innovative Talents (BX20180002), China Postdoctoral Science Foundation, and National Natural Science Foundation of China (41904145, 41421003, and 41627805). We acknowledge use of Van Allen Probes data under NASAs Prime Contract NAS5-01072, including HOPE data from the RBSP/ECT website (https://www.rbsp-ect.lanl.gov/science/DataDirectories.php), magnetic field data from the RBSP/EMFISIS website (http://emfisis.physics.uiowa.edu/data/index), and electric field data from the RBSP/EFW website (http://www.space.umn.edu/rbspefw-data/. The OMNI data are available at CDAWeb (http://omniweb.gsfc.nasa.gov). Publisher Copyright: ©2019. American Geophysical Union. All Rights Reserved.

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N2 - Six years of Van Allen Probes data are used to investigate cold plasmaspheric electrons affected by ultralow-frequency (ULF) waves in the inner magnetosphere (L<7) including spatial distributions, occurrence conditions, and resonant energy range. Events exhibit a global distribution within L= 4–7 but preferentially occur at L∼5.5–7 in the dayside, while there is higher occurrence rate in the duskside than dawnside. They can occur under different geomagnetic activities and solar wind velocities (VS), but the occurrence rates are increasing with larger AE, |SYMH|, and VS. These features are closely associated with the generation and propagation of ULF waves in Pc4 (45–150 s) and Pc5 (150–600 s) bands. Combined with electron observations from HOPE instrument, the resonant energies inferred from wave power indicate that cold electrons at ones to hundreds of electron volts can be affected by ULF waves. This study may shed new light on further investigations on the acceleration and transportation of cold plasmaspheric particles that would affect plasmaspheric material release to the Earth's magnetosphere and instabilities for exciting various waves.

AB - Six years of Van Allen Probes data are used to investigate cold plasmaspheric electrons affected by ultralow-frequency (ULF) waves in the inner magnetosphere (L<7) including spatial distributions, occurrence conditions, and resonant energy range. Events exhibit a global distribution within L= 4–7 but preferentially occur at L∼5.5–7 in the dayside, while there is higher occurrence rate in the duskside than dawnside. They can occur under different geomagnetic activities and solar wind velocities (VS), but the occurrence rates are increasing with larger AE, |SYMH|, and VS. These features are closely associated with the generation and propagation of ULF waves in Pc4 (45–150 s) and Pc5 (150–600 s) bands. Combined with electron observations from HOPE instrument, the resonant energies inferred from wave power indicate that cold electrons at ones to hundreds of electron volts can be affected by ULF waves. This study may shed new light on further investigations on the acceleration and transportation of cold plasmaspheric particles that would affect plasmaspheric material release to the Earth's magnetosphere and instabilities for exciting various waves.

KW - ULF waves

KW - cold plasmaspheric electrons

KW - drift-bounce resonance

KW - wave-particle interaction

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Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study

Abstract

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Keywords

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