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Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event

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Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event. / Clilverd, Mark; Cobbett, Neil; Roger, Craig et al.
In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 11, 11.2013, p. 6921-6935.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Clilverd, M, Cobbett, N, Roger, C, Brundell, J, Denton, M, Hartley, D, Rodriguez, J, Ranskin, D, Raita, T & Spanswick, E 2013, 'Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event', Journal of Geophysical Research: Space Physics, vol. 118, no. 11, pp. 6921-6935. https://doi.org/10.1002/2013JA019067

APA

Clilverd, M., Cobbett, N., Roger, C., Brundell, J., Denton, M., Hartley, D., Rodriguez, J., Ranskin, D., Raita, T., & Spanswick, E. (2013). Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event. Journal of Geophysical Research: Space Physics, 118(11), 6921-6935. https://doi.org/10.1002/2013JA019067

Vancouver

Clilverd M, Cobbett N, Roger C, Brundell J, Denton M, Hartley D et al. Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event. Journal of Geophysical Research: Space Physics. 2013 Nov;118(11):6921-6935. Epub 2013 Nov 5. doi: 10.1002/2013JA019067

Author

Clilverd, Mark ; Cobbett, Neil ; Roger, Craig et al. / Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event. In: Journal of Geophysical Research: Space Physics. 2013 ; Vol. 118, No. 11. pp. 6921-6935.

Bibtex

@article{a71dfb20dd7144629b379a8081a995c4,
title = "Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event",
abstract = "Data from two autonomous VLF radio receiver systems installed in a remote region of the Antarctic in 2012 is used to take advantage of the juxtaposition of the L=4.6 contour, and the Hawaii-Halley, Antarctica, great circle path as it passes over thick Antarctic ice shelf. The ice sheet conductivity leads to high sensitivity to changing D-region conditions, and the quasi-constant L-shell highlights outer radiation belt processes. The ground-based instruments observed several energetic electron precipitation events over a moderately active 24-hour period, during which the outer radiation belt electron flux declined at most energies and subsequently recovered. Combining the ground-based data with low- and geosynchronous-orbiting satellite observations on 27 February 2012, different driving mechanisms were observed for three precipitation events with clear signatures in phase space density and electron anisotropy. Comparison between flux measurements made by Polar-orbiting Operational Environmental Satellites (POES) in low Earth orbit and by the Antarctic instrumentation provides evidence of different cases of weak and strong diffusion into the bounce-loss-cone, helping to understand the physical mechanisms controlling the precipitation of energetic electrons into the atmosphere. Strong diffusion events occurred as the <600 keV fluxes began to recover as a result of adiabatic transport of electrons. One event appeared to have a factor of about 10 to 100 times more flux than was reported by POES, consistent with weak diffusion into the bounce-loss-cone. Two events had a factor of about 3 to 10 times more >30 keV flux than was reported by POES, more consistent with strong diffusion conditions.",
keywords = "energetic electron precipitation, Antarctica , flux dropout event",
author = "Mark Clilverd and Neil Cobbett and Craig Roger and James Brundell and Michael Denton and Dave Hartley and Juan Rodriguez and Donald Ranskin and Tero Raita and Emma Spanswick",
note = "{\textcopyright}2013. American Geophysical Union. All Rights Reserved.",
year = "2013",
month = nov,
doi = "10.1002/2013JA019067",
language = "English",
volume = "118",
pages = "6921--6935",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "11",

}

RIS

TY - JOUR

T1 - Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event

AU - Clilverd, Mark

AU - Cobbett, Neil

AU - Roger, Craig

AU - Brundell, James

AU - Denton, Michael

AU - Hartley, Dave

AU - Rodriguez, Juan

AU - Ranskin, Donald

AU - Raita, Tero

AU - Spanswick, Emma

N1 - ©2013. American Geophysical Union. All Rights Reserved.

PY - 2013/11

Y1 - 2013/11

N2 - Data from two autonomous VLF radio receiver systems installed in a remote region of the Antarctic in 2012 is used to take advantage of the juxtaposition of the L=4.6 contour, and the Hawaii-Halley, Antarctica, great circle path as it passes over thick Antarctic ice shelf. The ice sheet conductivity leads to high sensitivity to changing D-region conditions, and the quasi-constant L-shell highlights outer radiation belt processes. The ground-based instruments observed several energetic electron precipitation events over a moderately active 24-hour period, during which the outer radiation belt electron flux declined at most energies and subsequently recovered. Combining the ground-based data with low- and geosynchronous-orbiting satellite observations on 27 February 2012, different driving mechanisms were observed for three precipitation events with clear signatures in phase space density and electron anisotropy. Comparison between flux measurements made by Polar-orbiting Operational Environmental Satellites (POES) in low Earth orbit and by the Antarctic instrumentation provides evidence of different cases of weak and strong diffusion into the bounce-loss-cone, helping to understand the physical mechanisms controlling the precipitation of energetic electrons into the atmosphere. Strong diffusion events occurred as the <600 keV fluxes began to recover as a result of adiabatic transport of electrons. One event appeared to have a factor of about 10 to 100 times more flux than was reported by POES, consistent with weak diffusion into the bounce-loss-cone. Two events had a factor of about 3 to 10 times more >30 keV flux than was reported by POES, more consistent with strong diffusion conditions.

AB - Data from two autonomous VLF radio receiver systems installed in a remote region of the Antarctic in 2012 is used to take advantage of the juxtaposition of the L=4.6 contour, and the Hawaii-Halley, Antarctica, great circle path as it passes over thick Antarctic ice shelf. The ice sheet conductivity leads to high sensitivity to changing D-region conditions, and the quasi-constant L-shell highlights outer radiation belt processes. The ground-based instruments observed several energetic electron precipitation events over a moderately active 24-hour period, during which the outer radiation belt electron flux declined at most energies and subsequently recovered. Combining the ground-based data with low- and geosynchronous-orbiting satellite observations on 27 February 2012, different driving mechanisms were observed for three precipitation events with clear signatures in phase space density and electron anisotropy. Comparison between flux measurements made by Polar-orbiting Operational Environmental Satellites (POES) in low Earth orbit and by the Antarctic instrumentation provides evidence of different cases of weak and strong diffusion into the bounce-loss-cone, helping to understand the physical mechanisms controlling the precipitation of energetic electrons into the atmosphere. Strong diffusion events occurred as the <600 keV fluxes began to recover as a result of adiabatic transport of electrons. One event appeared to have a factor of about 10 to 100 times more flux than was reported by POES, consistent with weak diffusion into the bounce-loss-cone. Two events had a factor of about 3 to 10 times more >30 keV flux than was reported by POES, more consistent with strong diffusion conditions.

KW - energetic electron precipitation

KW - Antarctica

KW - flux dropout event

U2 - 10.1002/2013JA019067

DO - 10.1002/2013JA019067

M3 - Journal article

VL - 118

SP - 6921

EP - 6935

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 11

ER -