Home > Research > Publications & Outputs > Ground-based magnetometer determination of in s...

Associated organisational unit

View graph of relations

Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed

Research output: Contribution to journalJournal articlepeer-review

Published

Standard

Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed. / Rae, I.Jonathan; Mann, Ian R.; Murphy, Kyle R.; Ozeke, Louis G.; Milling, David K.; Chan, Anthony A; Elkington, Scot R.; Honary, Farideh.

In: Journal of Geophysical Research, Vol. 117, A04221, 2012.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Rae, IJ, Mann, IR, Murphy, KR, Ozeke, LG, Milling, DK, Chan, AA, Elkington, SR & Honary, F 2012, 'Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed', Journal of Geophysical Research, vol. 117, A04221. https://doi.org/10.1029/2011JA017335

APA

Rae, I. J., Mann, I. R., Murphy, K. R., Ozeke, L. G., Milling, D. K., Chan, A. A., Elkington, S. R., & Honary, F. (2012). Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed. Journal of Geophysical Research, 117, [A04221]. https://doi.org/10.1029/2011JA017335

Vancouver

Rae IJ, Mann IR, Murphy KR, Ozeke LG, Milling DK, Chan AA et al. Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed. Journal of Geophysical Research. 2012;117. A04221. https://doi.org/10.1029/2011JA017335

Author

Rae, I.Jonathan ; Mann, Ian R. ; Murphy, Kyle R. ; Ozeke, Louis G. ; Milling, David K. ; Chan, Anthony A ; Elkington, Scot R. ; Honary, Farideh. / Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed. In: Journal of Geophysical Research. 2012 ; Vol. 117.

Bibtex

@article{92b8bcd6dc3d493db6394bfb3e2f4bc4,
title = "Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed",
abstract = "We present a statistical characterization of ground-based ultra-low-frequency (1–15 mHz) magnetic wave power spectral densities (PSDs) as a function of latitude (corresponding to dipole L-shells from L2.5–8), local time, and solar wind speed. We show a clear latitudinal dependence on the PSD profiles, with PSDs increasing monotonically from low- to auroral zone latitudes, where PSDs are peaked before decay in amplitude at higher latitudes. In general, ULF wave powers are highest on the nightside, followed by the local morning, noon, and finally dusk sectors, and are well-characterized and well-ordered by solar wind speed at all MLTs spanning L2.5–8. A distinct peak in PSD in the 2–8 mHz frequency range above a background power law is evident at most stations studied in this paper, demonstrating a significant non power law like component in the ULF wave power spectrum, in particular at high solar wind speeds. We conclude that field line resonance (FLR) behavior in the magnetosphere is most likely responsible for the peak in PSD, and that such peaks should be included in any radiation belt radial diffusion model addressing radiation belt dynamics. Furthermore, we utilize a model in order to map the ground-based magnetic ULF wave power measurements into electric fields in the equatorial plane of an assumed dipole magnetic field, and find excellent agreement with the in situ CRRES electric fields shown by Brautigam et al. [2005], clearly demonstrating the utility of ground-based measurements in providing reliable estimates of ULF electric field PSD for nowcast input into radiation belt radial diffusion models.",
author = "I.Jonathan Rae and Mann, {Ian R.} and Murphy, {Kyle R.} and Ozeke, {Louis G.} and Milling, {David K.} and Chan, {Anthony A} and Elkington, {Scot R.} and Farideh Honary",
note = "{\textcopyright}2012. American Geophysical Union. All Rights Reserved.",
year = "2012",
doi = "10.1029/2011JA017335",
language = "English",
volume = "117",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",

}

RIS

TY - JOUR

T1 - Ground-based magnetometer determination of in situ Pc4–5 ULF electric field wave spectra as a function of solar wind speed

AU - Rae, I.Jonathan

AU - Mann, Ian R.

AU - Murphy, Kyle R.

AU - Ozeke, Louis G.

AU - Milling, David K.

AU - Chan, Anthony A

AU - Elkington, Scot R.

AU - Honary, Farideh

N1 - ©2012. American Geophysical Union. All Rights Reserved.

PY - 2012

Y1 - 2012

N2 - We present a statistical characterization of ground-based ultra-low-frequency (1–15 mHz) magnetic wave power spectral densities (PSDs) as a function of latitude (corresponding to dipole L-shells from L2.5–8), local time, and solar wind speed. We show a clear latitudinal dependence on the PSD profiles, with PSDs increasing monotonically from low- to auroral zone latitudes, where PSDs are peaked before decay in amplitude at higher latitudes. In general, ULF wave powers are highest on the nightside, followed by the local morning, noon, and finally dusk sectors, and are well-characterized and well-ordered by solar wind speed at all MLTs spanning L2.5–8. A distinct peak in PSD in the 2–8 mHz frequency range above a background power law is evident at most stations studied in this paper, demonstrating a significant non power law like component in the ULF wave power spectrum, in particular at high solar wind speeds. We conclude that field line resonance (FLR) behavior in the magnetosphere is most likely responsible for the peak in PSD, and that such peaks should be included in any radiation belt radial diffusion model addressing radiation belt dynamics. Furthermore, we utilize a model in order to map the ground-based magnetic ULF wave power measurements into electric fields in the equatorial plane of an assumed dipole magnetic field, and find excellent agreement with the in situ CRRES electric fields shown by Brautigam et al. [2005], clearly demonstrating the utility of ground-based measurements in providing reliable estimates of ULF electric field PSD for nowcast input into radiation belt radial diffusion models.

AB - We present a statistical characterization of ground-based ultra-low-frequency (1–15 mHz) magnetic wave power spectral densities (PSDs) as a function of latitude (corresponding to dipole L-shells from L2.5–8), local time, and solar wind speed. We show a clear latitudinal dependence on the PSD profiles, with PSDs increasing monotonically from low- to auroral zone latitudes, where PSDs are peaked before decay in amplitude at higher latitudes. In general, ULF wave powers are highest on the nightside, followed by the local morning, noon, and finally dusk sectors, and are well-characterized and well-ordered by solar wind speed at all MLTs spanning L2.5–8. A distinct peak in PSD in the 2–8 mHz frequency range above a background power law is evident at most stations studied in this paper, demonstrating a significant non power law like component in the ULF wave power spectrum, in particular at high solar wind speeds. We conclude that field line resonance (FLR) behavior in the magnetosphere is most likely responsible for the peak in PSD, and that such peaks should be included in any radiation belt radial diffusion model addressing radiation belt dynamics. Furthermore, we utilize a model in order to map the ground-based magnetic ULF wave power measurements into electric fields in the equatorial plane of an assumed dipole magnetic field, and find excellent agreement with the in situ CRRES electric fields shown by Brautigam et al. [2005], clearly demonstrating the utility of ground-based measurements in providing reliable estimates of ULF electric field PSD for nowcast input into radiation belt radial diffusion models.

U2 - 10.1029/2011JA017335

DO - 10.1029/2011JA017335

M3 - Journal article

VL - 117

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

M1 - A04221

ER -