Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event
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 conductivit...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2013
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/504882/ https://nora.nerc.ac.uk/id/eprint/504882/1/jgra50626.pdf https://doi.org/10.1002/2013JA019067 |
id |
ftnerc:oai:nora.nerc.ac.uk:504882 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:504882 2023-05-15T13:48:08+02:00 Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event Clilverd, Mark A. Cobbett, Neil Rodger, Craig J. Brundell, James B. Denton, Michael H. Hartley, David P. Rodriguez, Juan V. Danskin, Donald Raita, Tero Spanswick, Emma L. 2013-11-05 text http://nora.nerc.ac.uk/id/eprint/504882/ https://nora.nerc.ac.uk/id/eprint/504882/1/jgra50626.pdf https://doi.org/10.1002/2013JA019067 en eng Wiley https://nora.nerc.ac.uk/id/eprint/504882/1/jgra50626.pdf Clilverd, Mark A. orcid:0000-0002-7388-1529 Cobbett, Neil; Rodger, Craig J.; Brundell, James B.; Denton, Michael H.; Hartley, David P.; Rodriguez, Juan V.; Danskin, Donald; Raita, Tero; Spanswick, Emma L. 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 <https://doi.org/10.1002/2013JA019067> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/2013JA019067 2023-02-04T19:38:38Z 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 h 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Journal of Geophysical Research: Space Physics 118 11 6921 6935 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
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 h 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. |
format |
Article in Journal/Newspaper |
author |
Clilverd, Mark A. Cobbett, Neil Rodger, Craig J. Brundell, James B. Denton, Michael H. Hartley, David P. Rodriguez, Juan V. Danskin, Donald Raita, Tero Spanswick, Emma L. |
spellingShingle |
Clilverd, Mark A. Cobbett, Neil Rodger, Craig J. Brundell, James B. Denton, Michael H. Hartley, David P. Rodriguez, Juan V. Danskin, Donald Raita, Tero Spanswick, Emma L. Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
author_facet |
Clilverd, Mark A. Cobbett, Neil Rodger, Craig J. Brundell, James B. Denton, Michael H. Hartley, David P. Rodriguez, Juan V. Danskin, Donald Raita, Tero Spanswick, Emma L. |
author_sort |
Clilverd, Mark A. |
title |
Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
title_short |
Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
title_full |
Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
title_fullStr |
Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
title_full_unstemmed |
Energetic electron precipitation characteristics observed from Antarctica during a flux dropout event |
title_sort |
energetic electron precipitation characteristics observed from antarctica during a flux dropout event |
publisher |
Wiley |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/504882/ https://nora.nerc.ac.uk/id/eprint/504882/1/jgra50626.pdf https://doi.org/10.1002/2013JA019067 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/504882/1/jgra50626.pdf Clilverd, Mark A. orcid:0000-0002-7388-1529 Cobbett, Neil; Rodger, Craig J.; Brundell, James B.; Denton, Michael H.; Hartley, David P.; Rodriguez, Juan V.; Danskin, Donald; Raita, Tero; Spanswick, Emma L. 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 <https://doi.org/10.1002/2013JA019067> |
op_doi |
https://doi.org/10.1002/2013JA019067 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
118 |
container_issue |
11 |
container_start_page |
6921 |
op_container_end_page |
6935 |
_version_ |
1766248739916218368 |