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The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements

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The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements. / Sandhu, J. K.; Rae, I. J.; Staples, F. A. et al.
In: Journal of Geophysical Research: Space Physics, Vol. 126, No. 7, e2021JA029337, 29.07.2021.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Sandhu, JK, Rae, IJ, Staples, FA, Hartley, DP, Walach, MT, Elsden, T & Murphy, KR 2021, 'The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements', Journal of Geophysical Research: Space Physics, vol. 126, no. 7, e2021JA029337. https://doi.org/10.1029/2021JA029337

APA

Sandhu, J. K., Rae, I. J., Staples, F. A., Hartley, D. P., Walach, M. T., Elsden, T., & Murphy, K. R. (2021). The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements. Journal of Geophysical Research: Space Physics, 126(7), Article e2021JA029337. https://doi.org/10.1029/2021JA029337

Vancouver

Sandhu JK, Rae IJ, Staples FA, Hartley DP, Walach MT, Elsden T et al. The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements. Journal of Geophysical Research: Space Physics. 2021 Jul 29;126(7):e2021JA029337. Epub 2021 Jul 12. doi: 10.1029/2021JA029337

Author

Sandhu, J. K. ; Rae, I. J. ; Staples, F. A. et al. / The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements. In: Journal of Geophysical Research: Space Physics. 2021 ; Vol. 126, No. 7.

Bibtex

@article{37a297c6ab144097859eab854d1263fd,
title = "The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements",
abstract = "Ultra low frequency (ULF) waves play a crucial role in transporting and coupling energy within the magnetosphere. During geomagnetic storms, dayside magnetospheric ULF wave power is highly variable with strong enhancements that are dominated by elevated solar wind driving. However, the radial distribution of ULF wave power is complex - controlled interdependently by external solar wind driving and the internal magnetospheric structuring. We conducted a statistical analysis of observed storm-time ULF wave power from the Van Allen Probes spacecraft within 2012–2016. Focusing on the dayside (06 < magnetic local time ≤ 15), we observe large enhancements across 3 < L < 6 and a steep L dependence during the main phase. We consider how accounting for concurrent magnetopause and plasmapause locations may reduce statistical variability and improve parameterization of spatial trends over and above using the L value. Ordering storm time ULF wave power by L provides the weakest dependences from those considered, whereas ordering by distance from the magnetopause is more effective. We also explore dependences on local plasma density and find that spatially localized ULF wave power enhancements are confined within high density patches in the afternoon sector (likely plasmaspheric plumes). The results have critical implications for empirical models of ULF wave power and radial diffusion coefficients. We highlight the necessity of improved characterization of the highly distorted storm-time cold plasma density distribution, in order to more accurately predict ULF wave power.",
keywords = "ULF waves, geomagnetic Storms, Van Allen Probes, radial diffusion, inner magnetosphere, plasmasphere",
author = "Sandhu, {J. K.} and Rae, {I. J.} and Staples, {F. A.} and Hartley, {D. P.} and M.‐T. Walach and T. Elsden and Murphy, {K. R.}",
year = "2021",
month = jul,
day = "29",
doi = "10.1029/2021JA029337",
language = "English",
volume = "126",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "7",

}

RIS

TY - JOUR

T1 - The Roles of the Magnetopause and Plasmapause in Storm‐Time ULF Wave Power Enhancements

AU - Sandhu, J. K.

AU - Rae, I. J.

AU - Staples, F. A.

AU - Hartley, D. P.

AU - Walach, M.‐T.

AU - Elsden, T.

AU - Murphy, K. R.

PY - 2021/7/29

Y1 - 2021/7/29

N2 - Ultra low frequency (ULF) waves play a crucial role in transporting and coupling energy within the magnetosphere. During geomagnetic storms, dayside magnetospheric ULF wave power is highly variable with strong enhancements that are dominated by elevated solar wind driving. However, the radial distribution of ULF wave power is complex - controlled interdependently by external solar wind driving and the internal magnetospheric structuring. We conducted a statistical analysis of observed storm-time ULF wave power from the Van Allen Probes spacecraft within 2012–2016. Focusing on the dayside (06 < magnetic local time ≤ 15), we observe large enhancements across 3 < L < 6 and a steep L dependence during the main phase. We consider how accounting for concurrent magnetopause and plasmapause locations may reduce statistical variability and improve parameterization of spatial trends over and above using the L value. Ordering storm time ULF wave power by L provides the weakest dependences from those considered, whereas ordering by distance from the magnetopause is more effective. We also explore dependences on local plasma density and find that spatially localized ULF wave power enhancements are confined within high density patches in the afternoon sector (likely plasmaspheric plumes). The results have critical implications for empirical models of ULF wave power and radial diffusion coefficients. We highlight the necessity of improved characterization of the highly distorted storm-time cold plasma density distribution, in order to more accurately predict ULF wave power.

AB - Ultra low frequency (ULF) waves play a crucial role in transporting and coupling energy within the magnetosphere. During geomagnetic storms, dayside magnetospheric ULF wave power is highly variable with strong enhancements that are dominated by elevated solar wind driving. However, the radial distribution of ULF wave power is complex - controlled interdependently by external solar wind driving and the internal magnetospheric structuring. We conducted a statistical analysis of observed storm-time ULF wave power from the Van Allen Probes spacecraft within 2012–2016. Focusing on the dayside (06 < magnetic local time ≤ 15), we observe large enhancements across 3 < L < 6 and a steep L dependence during the main phase. We consider how accounting for concurrent magnetopause and plasmapause locations may reduce statistical variability and improve parameterization of spatial trends over and above using the L value. Ordering storm time ULF wave power by L provides the weakest dependences from those considered, whereas ordering by distance from the magnetopause is more effective. We also explore dependences on local plasma density and find that spatially localized ULF wave power enhancements are confined within high density patches in the afternoon sector (likely plasmaspheric plumes). The results have critical implications for empirical models of ULF wave power and radial diffusion coefficients. We highlight the necessity of improved characterization of the highly distorted storm-time cold plasma density distribution, in order to more accurately predict ULF wave power.

KW - ULF waves

KW - geomagnetic Storms

KW - Van Allen Probes

KW - radial diffusion

KW - inner magnetosphere

KW - plasmasphere

U2 - 10.1029/2021JA029337

DO - 10.1029/2021JA029337

M3 - Journal article

VL - 126

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 7

M1 - e2021JA029337

ER -