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A perspective on substorm dynamics using 10 years of auroral kilometric radiation observations from wind

A perspective on substorm dynamics using 10 years of auroral kilometric radiation observations from wind
A perspective on substorm dynamics using 10 years of auroral kilometric radiation observations from wind
We study 10 years (1995–2004 inclusive) of auroral kilometric radiation (AKR) radio emission data from the Wind spacecraft to examine the link between AKR and terrestrial substorms. We use substorm lists based on parameters including ground magnetometer signatures and geosynchronous particle injections as a basis for superposed epoch analyses of the AKR data. The results for each list show a similar, clear response of the AKR power around substorm onset. For nearly all event lists, the average response shows that the AKR power begins to increase around 20 min prior to expansion phase onset, as defined by the respective lists. The analysis of the spectral parameters of AKR bursts show that this increase in power is due to an extension of the source region to higher altitudes, which also precedes expansion phase onset by 20 min. Our observations show that the minimum frequency channel that observes AKR at this time, on average, is 60 kHz. AKR visibility is highly sensitive to observing spacecraft location, and the biggest radio response to substorm onset is seen in the 21:00–03:00 hr local time sector.
2169-9380
Waters, James E.
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Jackman, Caitriona M.
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Whiter, Daniel K.
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Forsyth, Colin
176bc4c5-4e98-4419-ad12-631e231b338b
Fogg, Alexandra R.
aea16623-279d-423a-85a3-c95868c0863d
Lamy, Laurent
be890ca9-445a-4fd9-8572-be416f007250
Cecconi, Baptiste
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Bonnin, Xavier
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Issautier, Karine
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Waters, James E.
7e6a7887-ad91-4b04-963e-48c734e778ed
Jackman, Caitriona M.
4c74323d-b410-48da-adf1-2207169696ab
Whiter, Daniel K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Forsyth, Colin
176bc4c5-4e98-4419-ad12-631e231b338b
Fogg, Alexandra R.
aea16623-279d-423a-85a3-c95868c0863d
Lamy, Laurent
be890ca9-445a-4fd9-8572-be416f007250
Cecconi, Baptiste
a33a7bf9-2bf2-4c61-809b-ba1ea19fd65d
Bonnin, Xavier
19da5602-2dac-4fad-a0fe-bde2683fda37
Issautier, Karine
9354fb42-cb07-4125-90a4-01c4cc20da5c

Waters, James E., Jackman, Caitriona M., Whiter, Daniel K., Forsyth, Colin, Fogg, Alexandra R., Lamy, Laurent, Cecconi, Baptiste, Bonnin, Xavier and Issautier, Karine (2022) A perspective on substorm dynamics using 10 years of auroral kilometric radiation observations from wind. Journal of Geophysical Research: Space Physics, 127 (9), [e2022JA030449]. (doi:10.1029/2022JA030449).

Record type: Article

Abstract

We study 10 years (1995–2004 inclusive) of auroral kilometric radiation (AKR) radio emission data from the Wind spacecraft to examine the link between AKR and terrestrial substorms. We use substorm lists based on parameters including ground magnetometer signatures and geosynchronous particle injections as a basis for superposed epoch analyses of the AKR data. The results for each list show a similar, clear response of the AKR power around substorm onset. For nearly all event lists, the average response shows that the AKR power begins to increase around 20 min prior to expansion phase onset, as defined by the respective lists. The analysis of the spectral parameters of AKR bursts show that this increase in power is due to an extension of the source region to higher altitudes, which also precedes expansion phase onset by 20 min. Our observations show that the minimum frequency channel that observes AKR at this time, on average, is 60 kHz. AKR visibility is highly sensitive to observing spacecraft location, and the biggest radio response to substorm onset is seen in the 21:00–03:00 hr local time sector.

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More information

Submitted date: 8 March 2022
Accepted/In Press date: 23 August 2022
e-pub ahead of print date: 6 September 2022
Published date: September 2022
Additional Information: © 2022. The Authors.

Identifiers

Local EPrints ID: 470332
URI: http://eprints.soton.ac.uk/id/eprint/470332
ISSN: 2169-9380
PURE UUID: 3f3ff459-960c-4239-9e0f-3073812af2f5
ORCID for James E. Waters: ORCID iD orcid.org/0000-0001-8164-5414
ORCID for Daniel K. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

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Date deposited: 06 Oct 2022 16:53
Last modified: 17 Mar 2024 03:14

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Contributors

Author: James E. Waters ORCID iD
Author: Caitriona M. Jackman
Author: Colin Forsyth
Author: Alexandra R. Fogg
Author: Laurent Lamy
Author: Baptiste Cecconi
Author: Xavier Bonnin
Author: Karine Issautier

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